5.3-RELEASE TODO

Scott Long scottl at FreeBSD.org
Fri Sep 24 00:41:12 PDT 2004


This is an automated weekly mailing of the FreeBSD 5.3 open issues list.
The live version of this list is available at:

    http://www.FreeBSD.org/releases/5.3R/todo.html

Automated mailing of this list will continue through the release of
FreeBSD 5.3


                          FreeBSD 5.3 Open Issues

                                Open Issues

 This is a list of open issues that need to be resolved for FreeBSD 5.3. If
 you have any updates for this list, please e-mail re at FreeBSD.org.

Show stopper defects for 5.3-RELEASE

 +------------------------------------------------------------------------+
 |       Issue        |  Status   | Responsible |       Description       |
 |--------------------+-----------+-------------+-------------------------|
 |                    |           |             |PREEMPTION appears to    |
 |                    |           |             |increase the chances of  |
 |                    |           |             |triggering a race        |
 |                    |           |             |condition in the thread  |
 |PREEMPTION-related  |           |Scott Long,  |context management and   |
 |hangs involving     |In progress|Julian       |scheduling code. Patches |
 |threads             |           |Elischer     |to mitigate the problem  |
 |                    |           |             |have been developed, with|
 |                    |           |             |on-going work to come up |
 |                    |           |             |with the correct solution|
 |                    |           |             |prior to 5.3.            |
 |--------------------+-----------+-------------+-------------------------|
 |                    |           |             |Jun Kuriyama has reported|
 |                    |           |             |problems with NFS over   |
 |                    |           |             |IPv6 not functioning     |
 |                    |           |             |correctly as of the      |
 |                    |           |             |improved NFS support for |
 |                    |           |             |disconnection changes.   |
 |NFS over IPv6       |In progress|Doug White   |Doug White has tracked   |
 |problems            |           |             |down the source of the   |
 |                    |           |             |problem (EMSGSIZE being  |
 |                    |           |             |returned by IPv6 UDP send|
 |                    |           |             |routine due to           |
 |                    |           |             |fragmentation), and is   |
 |                    |           |             |currently exploring      |
 |                    |           |             |possible fixes.          |
 |--------------------+-----------+-------------+-------------------------|
 |                    |           |             |There are reports of     |
 |                    |           |             |applications wedging in  |
 |                    |           |             |poll() and select() while|
 |                    |           |             |running the network stack|
 |                    |           |             |without the Giant lock. A|
 |                    |           |             |recent sleepq change     |
 |                    |           |             |appears to have caused   |
 |                    |           |             |some of the observed     |
 |                    |           |             |problems to go away      |
 |poll()/select()     |           |             |(others are difficult to |
 |application wedge   |In progress|Robert Watson|test for due to recent   |
 |reports with        |           |             |SMP instability). A fix  |
 |debug.mpsafenet=1   |           |             |has been committed to CVS|
 |                    |           |             |HEAD and merged to       |
 |                    |           |             |RELENG_5 and appears to  |
 |                    |           |             |resolve problems with    |
 |                    |           |             |poll(); we are waiting   |
 |                    |           |             |for feedback that it has |
 |                    |           |             |corrected the reported   |
 |                    |           |             |problems with select()   |
 |                    |           |             |also before moving this  |
 |                    |           |             |to "testing" status.     |
 |--------------------+-----------+-------------+-------------------------|
 |                    |           |             |ether_input() calls      |
 |                    |           |             |random_harvest() on the  |
 |                    |           |             |mbuf after it has been   |
 |                    |           |             |handed off to            |
 |ether_input() may   |           |Mark Murray, |ether_demux(), at which  |
 |harvest entropy from|In progress|Robert Watson|point it may have been   |
 |free()'d mbuf       |           |             |free()'d back to the mbuf|
 |                    |           |             |allocator. It also passes|
 |                    |           |             |in a pointer to the mbuf |
 |                    |           |             |itself, rather than      |
 |                    |           |             |ethernet frame header.   |
 |--------------------+-----------+-------------+-------------------------|
 |                    |           |             |Kris Kennaway has        |
 |                    |           |             |reported problems with   |
 |                    |           |             |boot time panic's, mutex |
 |boot time panic     |Not done   |-            |Giant not owned at       |
 |                    |           |             |kern/vfs_subr.c:1365. See|
 |                    |           |             |"Re: 5.3-RELEASE TODO"   |
 |                    |           |             |thread in -current at .     |
 |--------------------+-----------+-------------+-------------------------|
 |                    |           |             |The ifconf() ioctl for   |
 |                    |           |             |listing network          |
 |                    |           |             |interfaces performs a    |
 |                    |           |             |copyout() while holding  |
 |ifconf() sleep      |           |             |the global ifnet list    |
 |warning             |In progress|Robert Watson|mutex. This generates a  |
 |                    |           |             |witness warning in the   |
 |                    |           |             |event that copyout()     |
 |                    |           |             |generates a page fault,  |
 |                    |           |             |and risks more serious   |
 |                    |           |             |problems.                |
 +------------------------------------------------------------------------+

Required features for 5.3-RELEASE

 +------------------------------------------------------------------------+
 |      Issue      |   Status    |  Responsible   |      Description      |
 |-----------------+-------------+----------------+-----------------------|
 | BIND9 import    |             |                | BIND9 must be         |
 | into 5-CURRENT  | In progress | Doug Barton    | imported for          |
 |                 |             |                | 5.3-RELEASE.          |
 |-----------------+-------------+----------------+-----------------------|
 |                 |             |                | Kernel bits           |
 | KSE support for |             |                | implemented, userland |
 | sparc64         | --          | --             | not implemented.      |
 |                 |             |                | Required for          |
 |                 |             |                | 5.3-RELEASE.          |
 |-----------------+-------------+----------------+-----------------------|
 |                 |             |                | With improved support |
 |                 |             |                | for threading         |
 |                 |             |                | primitives, support   |
 |                 |             |                | is now required to    |
 | GDB thread      |             | David Xu,      | ease debugging of     |
 | support         | In progress | Marcel         | threaded              |
 |                 |             | Moolenaar      | applications.         |
 |                 |             |                | Ideally, this support |
 |                 |             |                | will work for both    |
 |                 |             |                | libthr and libkse     |
 |                 |             |                | threading models.     |
 |-----------------+-------------+----------------+-----------------------|
 |                 |             |                | There have been       |
 |                 |             |                | several reports that  |
 |                 |             |                | growfs(8) works       |
 |                 |             |                | improperly with large |
 | Reports of UFS2 |             |                | disk sizes, and other |
 | "large disk"    | In progress | Scott Long     | size-related nits in  |
 | problems        |             |                | the current disk and  |
 |                 |             |                | label management tool |
 |                 |             |                | set. These must be    |
 |                 |             |                | resolved for          |
 |                 |             |                | 5.3-RELEASE.          |
 |-----------------+-------------+----------------+-----------------------|
 |                 |             |                | Synaptics updates to  |
 |                 |             |                | the psm(4) driver     |
 | Synaptics       |             |                | have resulted in poor |
 | touchpad        | In progress | Philip Paeps   | interactivity for     |
 | problems        |             |                | taps and button press |
 |                 |             |                | events for some       |
 |                 |             |                | users.                |
 |-----------------+-------------+----------------+-----------------------|
 |                 |             |                | Entropy harvesting in |
 |                 |             |                | the interrupt and     |
 |                 |             |                | incoming packet paths |
 |                 |             |                | currently involves a  |
 |                 |             |                | large number of mutex |
 |                 |             |                | operations. In order  |
 |                 |             |                | to improve            |
 |                 |             |                | performance, it is    |
 | Entropy         |             |                | desirable to reduce   |
 | harvesting      | In progress | Robert Watson, | the number of mutex   |
 | optimizations   |             | Mark Murray    | operations            |
 |                 |             |                | substantially. Work   |
 |                 |             |                | is in progress to     |
 |                 |             |                | improve the           |
 |                 |             |                | harvesting code along |
 |                 |             |                | these lines, but has  |
 |                 |             |                | not yet been properly |
 |                 |             |                | measured, and         |
 |                 |             |                | therefore not yet     |
 |                 |             |                | merged to CVS.        |
 +------------------------------------------------------------------------+

Desired features for 5.3-RELEASE

 +------------------------------------------------------------------------+
 |      Issue       |   Status    |  Responsible   |     Description      |
 |------------------+-------------+----------------+----------------------|
 |                  |             |                | Almost all process   |
 |                  |             |                | debugging tools have |
 |                  |             |                | been updated to use  |
 |                  |             |                | non-procfs kernel    |
 |                  |             |                | primitives, with the |
 |                  |             |                | exception of         |
 |                  |             |                | truss(1). As procfs  |
 |                  |             |                | is considered        |
 |                  |             |                | deprecated due to    |
 |                  |             |                | its inherent         |
 |                  |             |                | security risks, it   |
 | truss support    |             |                | is highly desirable  |
 | for ptrace       | --          | --             | to update truss to   |
 |                  |             |                | operate in a         |
 |                  |             |                | post-procfs world.   |
 |                  |             |                | Dag-Erling Smorgrav  |
 |                  |             |                | had prototype        |
 |                  |             |                | patches;             |
 |                  |             |                | Robert Drehmel is    |
 |                  |             |                | developing and       |
 |                  |             |                | testing patches now. |
 |                  |             |                | Support for system   |
 |                  |             |                | call tracing has     |
 |                  |             |                | been added to        |
 |                  |             |                | ptrace().            |
 |------------------+-------------+----------------+----------------------|
 |                  |             |                | FAST_IPSEC currently |
 |                  |             |                | cannot be used       |
 |                  |             |                | directly with the    |
 |                  |             |                | KAME IPv6            |
 |                  |             |                | implementation,      |
 |                  |             |                | requiring an         |
 |                  |             |                | additional level of  |
 |                  |             |                | IP tunnel            |
 |                  |             |                | indirection to       |
 |                  |             |                | protect IPv6 packets |
 | FAST_IPSEC and   |             |                | when using hardware  |
 | KAME             | Not done    | --             | crypto acceleration. |
 | compatibility    |             |                | This issue must be   |
 |                  |             |                | resolved so that the |
 |                  |             |                | two services may     |
 |                  |             |                | more easily be used  |
 |                  |             |                | together. Among      |
 |                  |             |                | other things, this   |
 |                  |             |                | will require a       |
 |                  |             |                | careful review of    |
 |                  |             |                | the handling of mbuf |
 |                  |             |                | header copying and   |
 |                  |             |                | m_tag support in the |
 |                  |             |                | KAME IPv6 code.      |
 |------------------+-------------+----------------+----------------------|
 |                  |             |                | A process cannot be  |
 |                  |             |                | interrupted while    |
 |                  |             |                | waiting on a lock.   |
 | rpc.lockd(8)     |             |                | Fixing this requires |
 | stability        | --          | --             | that the RPC code be |
 |                  |             |                | taught how to deal   |
 |                  |             |                | with lock            |
 |                  |             |                | cancellation and     |
 |                  |             |                | interruption events. |
 |------------------+-------------+----------------+----------------------|
 |                  |             |                | Kernel modules are   |
 |                  |             |                | currently built      |
 |                  |             |                | independently from a |
 |                  |             |                | kernel               |
 |                  |             |                | configuration, and   |
 |                  |             |                | independently from   |
 |                  |             |                | one another,         |
 |                  |             |                | resulting in         |
 |                  |             |                | substantially        |
 |                  |             |                | redundant            |
 |                  |             |                | compilation of       |
 |                  |             |                | objects, as well as  |
 |                  |             |                | the inability to     |
 |                  |             |                | easily manage        |
 |                  |             |                | compile-time options |
 | Revised kld      |             |                | for kernel objects   |
 | build            | Not done    | Peter Wemm     | (such as MAC, PAE,   |
 | infrastructure   |             |                | etc) that may        |
 |                  |             |                | require conditional  |
 |                  |             |                | compilation in the   |
 |                  |             |                | kernel modules. In   |
 |                  |             |                | order to improve     |
 |                  |             |                | build performance    |
 |                  |             |                | and better support   |
 |                  |             |                | options of this      |
 |                  |             |                | sort, the KLD build  |
 |                  |             |                | infrastructure needs |
 |                  |             |                | to be revamped.      |
 |                  |             |                | Peter Wemm has done  |
 |                  |             |                | some initial         |
 |                  |             |                | prototyping, and     |
 |                  |             |                | should be contacted  |
 |                  |             |                | before starting on   |
 |                  |             |                | this work.           |
 |------------------+-------------+----------------+----------------------|
 |                  |             |                | Apple's Darwin       |
 |                  |             |                | operating system has |
 |                  |             |                | fairly extensive     |
 | Merge of Darwin  |             |                | improvements to      |
 | msdosfs, other   | Not done    | --             | msdosfs and other    |
 | fixes            |             |                | kernel services;     |
 |                  |             |                | these fixes must be  |
 |                  |             |                | reviewed and merged  |
 |                  |             |                | to the FreeBSD tree. |
 |------------------+-------------+----------------+----------------------|
 |                  |             |                | Truss appears to     |
 |                  |             |                | contain a race       |
 |                  |             |                | condition during the |
 |                  |             |                | start-up of          |
 |                  |             |                | debugging, which can |
 |                  |             |                | result in truss      |
 |                  |             |                | failing to attach to |
 |                  |             |                | the process before   |
 |                  |             |                | it exits. The        |
 |                  |             |                | symptom is that      |
 |                  |             |                | truss reports that   |
 |                  |             |                | it cannot open the   |
 |                  |             |                | procfs node          |
 |                  |             |                | supporting the       |
 |                  |             |                | process being        |
 |                  |             |                | debugged. A bug also |
 | Race conditions  | Errata      | Robert Drehmel | appears to exist     |
 | in truss         | candidate   |                | where in truss will  |
 |                  |             |                | hang if execve()     |
 |                  |             |                | returns ENOENT. A    |
 |                  |             |                | further race appears |
 |                  |             |                | to exist in which    |
 |                  |             |                | truss will return    |
 |                  |             |                | "PIOCWAIT:           |
 |                  |             |                | Input/output error"  |
 |                  |             |                | occasionally on      |
 |                  |             |                | startup. The fix for |
 |                  |             |                | this sufficiently    |
 |                  |             |                | changes process      |
 |                  |             |                | execution handling   |
 |                  |             |                | that we will defer   |
 |                  |             |                | the fix to post-5.0  |
 |                  |             |                | and consider this    |
 |                  |             |                | errata.              |
 |------------------+-------------+----------------+----------------------|
 |                  |             |                | Truss appears to     |
 |                  |             |                | have another         |
 |                  |             |                | problem. It is       |
 |                  |             |                | repeatable by        |
 |                  |             |                | running "truss -f    |
 | More truss       | Not done    | --             | fsck -p /",          |
 | problems         |             |                | suspending it with   |
 |                  |             |                | ^Z, and then killing |
 |                  |             |                | truss. It will leave |
 |                  |             |                | behind the fsck      |
 |                  |             |                | processes which will |
 |                  |             |                | be unkillable.       |
 |------------------+-------------+----------------+----------------------|
 |                  |             |                | Many systems         |
 |                  |             |                | supporting POSIX.1e  |
 |                  |             |                | ACLs permit a minor  |
 |                  |             |                | violation to that    |
 |                  |             |                | specification, in    |
 |                  |             |                | which the ACL_MASK   |
 | ACL_MASK         |             |                | entry overrides the  |
 | override of      | Not done    | Robert Watson  | umask, rather than   |
 | umask support in |             |                | being intersected    |
 | UFS              |             |                | with it. The         |
 |                  |             |                | resulting semantics  |
 |                  |             |                | can be useful in     |
 |                  |             |                | group-oriented       |
 |                  |             |                | environments, and as |
 |                  |             |                | such would be very   |
 |                  |             |                | helpful on FreeBSD.  |
 |------------------+-------------+----------------+----------------------|
 |                  |             |                | The LOR reported in  |
 |                  |             |                | PR kern/55175 needs  |
 | filedesc LOR     | Not done    | --             | to be fixed.         |
 |                  |             |                | Filedesc locking     |
 |                  |             |                | needs to be heavily  |
 |                  |             |                | reviewed in general. |
 |------------------+-------------+----------------+----------------------|
 |                  |             |                | Currently, MAC       |
 |                  |             |                | protections are      |
 |                  |             |                | enforced only on     |
 |                  |             |                | locally originated   |
 |                  |             |                | file system          |
 |                  |             |                | operations (VOPs),   |
 |                  |             |                | and not on RPCs      |
 |                  |             |                | generated via the    |
 |                  |             |                | NFS server.          |
 | MAC support for  |             |                | Improvements in NFS  |
 | NFS Server       | Not done    | Robert Watson  | server credential    |
 |                  |             |                | handling are         |
 |                  |             |                | required to correct  |
 |                  |             |                | this problem, as     |
 |                  |             |                | well as the          |
 |                  |             |                | introduction of new  |
 |                  |             |                | entry points to      |
 |                  |             |                | properly label NFS   |
 |                  |             |                | credentials and      |
 |                  |             |                | perform enforcement  |
 |                  |             |                | properly.            |
 |------------------+-------------+----------------+----------------------|
 |                  |             |                | All PCI drivers must |
 |                  |             |                | use busdma for DMA;  |
 |                  |             |                | no use of vtophys()  |
 | busdma in all    | In progress | --             | will be permitted    |
 | PCI drivers      |             |                | for any recent       |
 |                  |             |                | device driver. ISA   |
 |                  |             |                | drivers may be       |
 |                  |             |                | exempt.              |
 |------------------+-------------+----------------+----------------------|
 |                  |             |                | Userland bits        |
 | KSE support for  | In progress | Marcel         | implemented, kernel  |
 | alpha            |             | Moolenaar      | bits not             |
 |                  |             |                | implemented.         |
 |------------------+-------------+----------------+----------------------|
 |                  |             |                | For kernel API/ABI   |
 |                  |             |                | compatibility        |
 |                  |             |                | reasons, it would be |
 | CAM locking      | In progress | Scott Long,    | desirable to have    |
 |                  |             | Justin Gibbs   | the CAM locking      |
 |                  |             |                | strategy determined  |
 |                  |             |                | and loosely          |
 |                  |             |                | implemented for 5.3. |
 |------------------+-------------+----------------+----------------------|
 |                  |             |                | When running syscons |
 |                  |             |                | on an Ultra-30 with  |
 |                  |             |                | Creator-3D typing    |
 |                  |             |                | characters on the    |
 |                  |             |                | keyboard produces    |
 |                  |             |                | garbage. Problem     |
 |                  |             |                | reported by Kris     |
 | syscons not      |             |                | Kennaway. Debugging  |
 | working on       | Not done    | --             | difficult due to     |
 | Sparc64 Ultra-30 |             |                | lack of this         |
 |                  |             |                | particular           |
 |                  |             |                | configuration among  |
 |                  |             |                | developers and       |
 |                  |             |                | problem isn't        |
 |                  |             |                | present on similar   |
 |                  |             |                | hardware (e.g. no    |
 |                  |             |                | problem on Ultra-60  |
 |                  |             |                | w/Creator-3D).       |
 +------------------------------------------------------------------------+

Documentation items that must be resolved for 5.3

+-------------------------------------------------------------------------------------------------+
|    Issue     |  Status   |Responsible|                       Description                        |
|--------------+-----------+-----------+----------------------------------------------------------|
|              |           |Gavin      |The installation documentation doesn't take into account  |
|i386 Floppy   |           |Atkinson,  |the new floppy images (with a full kernel split across    |
|Installation  |Done       |Bruce A.   |multiple disks). This should be updated.                  |
|Docs          |           |Mah        |References:                                               |
|              |           |           |docs/70485 (closed)                                       |
|--------------+-----------+-----------+----------------------------------------------------------|
|Finish        |           |Simon L.   |Finish removing mention of individual devices in the      |
|hardware notes|In progress|Nielsen,   |hardware notes and use auto-generated lists, based on     |
|trimming      |           |Christian  |driver manual pages, instead.                             |
|              |           |Brueffer   |                                                          |
|--------------+-----------+-----------+----------------------------------------------------------|
|              |           |           |The snd(4) and pcm(4) drivers have been renamed but their |
|              |           |           |manual pages are still outdated. sound(4) has to be added |
|              |           |           |and pcm(4), csa(4), gusc(4), sbc(4), and uaudio(4) should |
|sound(4)      |           |           |be revised. Other manual pages which refer to pcm(4) (if  |
|related manual|In progress|Simon L.   |any) should possibly be revised, too. In addition,        |
|pages         |           |Nielsen    |supported cards list needs to be updated.                 |
|              |           |           |References:                                               |
|              |           |           |Manpage for snd_solo on -doc@                             |
|              |           |           |[PATCH] sound(4) related manpages 5.3 TODO item on -doc@  |
|              |           |           |src/share/man/man4/Makefile rev.1.279                     |
|--------------+-----------+-----------+----------------------------------------------------------|
|              |           |           |This section is outdated, some rewrites are needed for    |
|Sound section |           |Marc       |5.3-RELEASE.                                              |
|in the        |Done       |Fonvieille |References:                                               |
|Handbook      |           |           |doc/en_US.ISO8859-1/books/handbook/multimedia/chapter.sgml|
|              |           |           |rev.1.94                                                  |
|--------------+-----------+-----------+----------------------------------------------------------|
|FDP           |           |           |With the snd(4) and pcm(4) drivers changes, documentations|
|documentations|Not done   |--         |(FAQ) regarding the use of these drivers need an update.  |
|related pcm(4)|           |           |                                                          |
|--------------+-----------+-----------+----------------------------------------------------------|
|              |           |           |Xin LI pointed out that FreeBSD 5.3-RELEASE is the first  |
|              |           |           |stable release on 5.X and it is (hopefully) not for early |
|              |           |           |adopters. Early Adopter's Guide is still useful, but      |
|Early         |           |Bruce A.   |contains a bit old information. Some parts of this guide  |
|Adopter's     |Done       |Mah, Tom   |need a rewrite, and this document should be published as  |
|Guide         |           |Rhodes     |"4.X to 5.X Migration Guide", which focuses difference    |
|              |           |           |between 4.X and 5.X.                                      |
|              |           |           |References:                                               |
|              |           |           |Draft for review                                          |
|              |           |           |discussion on -doc@ and -current@                         |
|--------------+-----------+-----------+----------------------------------------------------------|
|              |           |           |Some parts are outdated. doc/70485 has been committed, but|
|              |           |           |more work is needed to reflect the realities. bmah@       |
|              |           |           |pointed out that we should have "quick-start" installation|
|Installation  |Not done   |Tom Rhodes |guide for each platform instead of the current ones       |
|Notes         |           |           |because they become too long and difficult to be          |
|              |           |           |maintained.                                               |
|              |           |           |References:                                               |
|              |           |           |doc/70485 (closed)                                        |
|--------------+-----------+-----------+----------------------------------------------------------|
|              |           |Ken Tom,   |Update the X11 chapter of the Handbook for X.Org's X11    |
|Xorg          |Done       |Marc       |server.                                                   |
|              |           |Fonvieille |References:                                               |
|              |           |           |books/handbook/config/chapter.sgml rev.1.147              |
|--------------+-----------+-----------+----------------------------------------------------------|
|              |           |           |Ch.11.4 and 11.5 of the Handbook must be updated to       |
|              |           |           |mention the new rc.d scripts and some ports use           |
|rc.d scripts  |In progress|Tom Rhodes |/etc/rc.conf for their configuration.                     |
|              |           |           |References:                                               |
|              |           |           |books/handbook/config/chapter.sgml rev.1.170              |
|              |           |           |books/handbook/config/chapter.sgml rev.1.172              |
|--------------+-----------+-----------+----------------------------------------------------------|
|Handbook's    |           |           |Chapter 8 must be updated to match 5.3-RELEASE.           |
|kernel        |Done       |Ceri Davies|References:                                               |
|configuration |           |           |docs/70674 (closed)                                       |
|chapter       |           |           |books/handbook/kernelconfig/chapter.sgml rev.1.135        |
|--------------+-----------+-----------+----------------------------------------------------------|
|              |           |           |Some parts of Section 14.10 are outdated and are not      |
|Handbook's    |           |           |correct for 5.X systems.                                  |
|IPsec section |Not done   |--         |References:                                               |
|              |           |           |ipsec on -doc@                                            |
|              |           |           |Problem with IPSEC in handbook on -doc@                   |
|--------------+-----------+-----------+----------------------------------------------------------|
|Handbook's    |Not done   |--         |Vinum chapter needs to be revised for 5.X systems.        |
|Vinum chapter |           |           |                                                          |
+-------------------------------------------------------------------------------------------------+

Testing focuses for 5.3-RELEASE

 +------------------------------------------------------------------------+
 |       Issue       |    Status     | Responsible  |     Description     |
 |-------------------+---------------+--------------+---------------------|
 |                   |               |              | SCHED_ULE provides  |
 |                   |               |              | better              |
 |                   |               |              | interactivity,      |
 |                   |               |              | higher performance, |
 | SCHED_ULE as the  | Needs testing | Jeff         | and the ability to  |
 | default scheduler |               | Roberson     | support pinning and |
 |                   |               |              | affinity. Basic HTT |
 |                   |               |              | scheduling policies |
 |                   |               |              | should be in place  |
 |                   |               |              | for 5.3 also.       |
 |-------------------+---------------+--------------+---------------------|
 |                   |               |              | KSE has matured to  |
 |                   |               |              | the point of being  |
 |                   |               |              | more stable and     |
 |                   |               |              | POSIX-compliant     |
 |                   |               |              | than the            |
 |                   |               |              | traditional libc_r. |
 |                   |               |              | All Tier-1          |
 |                   |               |              | platforms MUST have |
 | KSE as the        |               | David Xu,    | stable KSE support  |
 | default threads   | Needs testing | Daniel       | for 5.3 in order to |
 | library           |               | Eischen      | support a           |
 |                   |               |              | consistent          |
 |                   |               |              | transition.         |
 |                   |               |              | Additionally, all   |
 |                   |               |              | ports that depend   |
 |                   |               |              | on the pthreads API |
 |                   |               |              | must be modified to |
 |                   |               |              | properly detect and |
 |                   |               |              | support the default |
 |                   |               |              | threading library.  |
 |-------------------+---------------+--------------+---------------------|
 |                   |               |              | Binutils needs      |
 |                   |               |              | updating in order   |
 | Updated binutils  |               | David        | to support new      |
 | for all platforms | Needs testing | O'Brien      | platforms, newer    |
 |                   |               |              | GDB versions, and   |
 |                   |               |              | Thread Local        |
 |                   |               |              | Storage.            |
 |-------------------+---------------+--------------+---------------------|
 |                   |               |              | The previous GCC    |
 |                   |               |              | 3.3 snapshot        |
 |                   |               |              | included            |
 |                   |               |              | regressions in      |
 |                   |               |              | alignment of        |
 |                   |               |              | floating point      |
 | gcc 3.3 floating  |               |              | arguments,          |
 | point alignment   | Needs testing |              | resulting in a      |
 | regression        |               |              | substantial         |
 |                   |               |              | performance         |
 |                   |               |              | degradation. The    |
 |                   |               |              | recent GCC 3.4.2    |
 |                   |               |              | import should fix   |
 |                   |               |              | this, but more      |
 |                   |               |              | testing is needed.  |
 |-------------------+---------------+--------------+---------------------|
 |                   |               |              | Jun Kuriyama has    |
 |                   |               |              | reportged a failed  |
 |                   |               |              | locking assertion   |
 |                   |               |              | with IPv6 TCP       |
 | in6_pcbnotify()   | Needs testing | Robert       | notifications. A    |
 | panic with TCP    |               | Watson       | patch has been      |
 |                   |               |              | committed to the    |
 |                   |               |              | CVS HEAD and        |
 |                   |               |              | RELENG_5 and needs  |
 |                   |               |              | further testing.    |
 |-------------------+---------------+--------------+---------------------|
 |                   |               |              | To complete support |
 |                   |               |              | for thread-local    |
 |                   |               |              | storage on FreeBSD, |
 |                   |               |              | per-architecture    |
 | Per-platform      |               | Doug Rabson, | changes must be     |
 | Thread-Local      | Needs testing | Marcel       | made. Currently     |
 | Storage           |               | Moolenaar    | pending platforms   |
 |                   |               |              | are amd64, alpha,   |
 |                   |               |              | ia64, i386,         |
 |                   |               |              | sparc64, and        |
 |                   |               |              | powerpc.            |
 |-------------------+---------------+--------------+---------------------|
 |                   |               |              | High load on SMP    |
 |                   |               |              | systems appears to  |
 |                   |               |              | result in a hard    |
 |                   |               |              | hang related to VM  |
 |                   |               |              | IPI. Doug White has |
 | SMP instability   |               | Doug White,  | prepared a          |
 | under load        | Needs testing | Alan L. Cox  | candidate patch     |
 |                   |               |              | that appears to     |
 |                   |               |              | resolve this        |
 |                   |               |              | instability, which  |
 |                   |               |              | is currently in     |
 |                   |               |              | testing for merge   |
 |                   |               |              | to the CVS HEAD.    |
 |-------------------+---------------+--------------+---------------------|
 |                   |               |              | Significant parts   |
 |                   |               |              | of the network      |
 |                   |               |              | stack (especially   |
 |                   |               |              | IPv4, UNIX domain   |
 |                   |               |              | IPC, and sockets)   |
 |                   |               |              | now have            |
 |                   |               |              | fine-grained        |
 |                   |               |              | locking of their    |
 |                   |               |              | data structures.    |
 |                   |               |              | It's possible to    |
 |                   |               |              | run many common     |
 |                   |               |              | network subsystems  |
 |                   |               |              | and services        |
 |                   |               |              | without the Giant   |
 | Fine-grained      |               |              | lock. However, a    |
 | network stack     | Needs testing | Robert       | number of device    |
 | locking without   |               | Watson       | drivers and less    |
 | Giant             |               |              | mainstream network  |
 |                   |               |              | subsystems are      |
 |                   |               |              | currently not       |
 |                   |               |              | MPSAFE. By          |
 |                   |               |              | 5.3-RELEASE, it is  |
 |                   |               |              | necessary to have   |
 |                   |               |              | the vast majority   |
 |                   |               |              | of network code     |
 |                   |               |              | running without     |
 |                   |               |              | Giant, including    |
 |                   |               |              | sockets, permitting |
 |                   |               |              | complete            |
 |                   |               |              | local<->remote      |
 |                   |               |              | delivery without    |
 |                   |               |              | grabbing Giant.     |
 |-------------------+---------------+--------------+---------------------|
 |                   |               |              | KLDs work when      |
 |                   |               |              | loaded from         |
 |                   |               |              | userland, but not   |
 |                   |               | David        | from the loader.    |
 | kld support for   | Needs testing | O'Brien, Ian | kldxref and loader  |
 | amd64             |               | Dowse        | support has been    |
 |                   |               |              | committed to HEAD   |
 |                   |               |              | and RELENG_5 and    |
 |                   |               |              | needs final         |
 |                   |               |              | testing.            |
 |-------------------+---------------+--------------+---------------------|
 |                   |               |              | Recent changes to   |
 |                   |               |              | the ATA driver      |
 |                   |               |              | trigger a bug on    |
 | ATA panics under  |               | So/ren       | sparc64 that causes |
 | sparc64           | Needs testing | Schmidt,     | a panic on boot.    |
 |                   |               | Scott Long   | This was caused by  |
 |                   |               |              | bugs in busdma that |
 |                   |               |              | have been hopefully |
 |                   |               |              | fixed.              |
 +------------------------------------------------------------------------+

   ----------------------------------------------------------------------

  home   |   contact   |   legal   |   (c) 1995-2004 The FreeBSD Project.
  All rights reserved.
  Last modified: 2004/09/18 19:31:45


More information about the freebsd-current mailing list