kern/183753: Regression since r255138: network is slow, kernel: failed to create new mbuf
iz-rpi03 at hs-karlsruhe.de
Fri Nov 8 08:30:02 UTC 2013
The following reply was made to PR kern/183753; it has been noted by GNATS.
From: Ralf Wenk <iz-rpi03 at hs-karlsruhe.de>
To: Oliver Pinter <oliver.pntr at gmail.com>
Cc: freebsd-gnats-submit at freebsd.org
Subject: Re: kern/183753: Regression since r255138: network is slow, kernel:
failed to create new mbuf
Date: Fri, 08 Nov 2013 09:23:19 +0100
On 11/7/13, Oliver Pinter <oliver.pntr at gmail.com> wrote:
> On 11/7/13, Ralf Wenk <iz-rpi03 at hs-karlsruhe.de> wrote:
> >>Number: 183753
> >>Category: kern
> >>Synopsis: Regression since r255138: network is slow, kernel: failed
> >> to create new mbuf
> >>Confidential: no
> >>Severity: non-critical
> >>Priority: low
> >>Responsible: freebsd-bugs
> >>State: open
> >>Class: sw-bug
> >>Submitter-Id: current-users
> >>Arrival-Date: Thu Nov 07 15:20:00 UTC 2013
> >>Originator: Ralf Wenk
> >>Release: FreeBSD 10.0-CURRENT arm
> > Hochschule Karlsruhe, University of Applied Sciences
> > FreeBSD raspberry-pi 10.0-CURRENT FreeBSD 10.0-CURRENT #0 r255138: Wed Nov
> > 6 08:42:26 CET 2013
> > root at IZ-FreeBSD1:/usr/obj/arm.armv6/root/rpi/255138/sys/RPI-Bsc arm
> > While rsync(1)-ing an 1 GB file the RPi gets almost unresponsible after a
> > while and on the serial console there are lots of
> > smsc0: warning: failed to create new mbuf
> > kernel messages. Occasionaly dotted with the
> > [zone: mbuf_cluster] kern.ipc.nmbclusters limit reached
> > kernel message.
> > rsync shows a transfer speed of 27.40kB/s (over DSL) even if the files are
> > already in sync and only the timestamps differ.
> > Increasing the value of kern.ipc.nmbclusters by the factor of 2 just
> > delayed
> > the moment the problem happens.
> > The first release which shows this is r25518. r255166 and older do not.
Oh, I got the version numbers absolutely wrong here. The sentences should be:
The first release which shows this is r255138. r255136 and older do not.
> > rsync shows a transfer speed of 535.46kB/s (over DSL) on r255166 and older
> > releases.
> > Use a 1GB file as transfer file.
> > If already transfered touch(1) transfer file at the source host.
> > rsync -trv --modify-window=1 --compress --progress --stats --inplace
> > --delete transfer_file user at target.host:/path/to/
> > Await problem around 10% of the file is transfered.
> > Undo r255138.
> > _______________________________________________
> possible workaround:
> sysctl kern.eventtimer.idletick=1
Just tried it with r255138. Unfortunately there is no change in behavior,
so it is not a workaround.
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