kern/183753: Regression since r255138: network is slow, kernel: failed to create new mbuf

[Oliver Pinter]

The following reply was made to PR kern/183753; it has been noted by GNATS.

From: Oliver Pinter <oliver.pntr at gmail.com>
To: Ralf Wenk <iz-rpi03 at hs-karlsruhe.de>
Cc: freebsd-gnats-submit at freebsd.org
Subject: Re: kern/183753: Regression since r255138: network is slow, kernel:
 failed to create new mbuf
Date: Thu, 7 Nov 2013 23:51:56 +0100

 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
 >>Quarter:
 >>Keywords:
 >>Date-Required:
 >>Class:          sw-bug
 >>Submitter-Id:   current-users
 >>Arrival-Date:   Thu Nov 07 15:20:00 UTC 2013
 >>Closed-Date:
 >>Last-Modified:
 >>Originator:     Ralf Wenk
 >>Release:        FreeBSD 10.0-CURRENT arm
 >>Organization:
 > Hochschule Karlsruhe, University of Applied Sciences
 >>Environment:
 > 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
 >>Description:
 > 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.
 >
 > rsync shows a transfer speed of 535.46kB/s (over DSL) on r255166 and older
 > releases.
 >>How-To-Repeat:
 > 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.
 >>Fix:
 > Undo r255138.
 >
 >>Release-Note:
 >>Audit-Trail:
 >>Unformatted:
 > _______________________________________________
 > freebsd-bugs at freebsd.org mailing list
 > http://lists.freebsd.org/mailman/listinfo/freebsd-bugs
 > To unsubscribe, send any mail to "freebsd-bugs-unsubscribe at freebsd.org"
 >
 
 possible workaround:
 
 sysctl kern.eventtimer.idletick=1