On Wed, 2007-09-26 at 10:52 +0200, Martin Michlmayr wrote:
> I noticed that my network performance has gone down from 2.6.22
> >from [ 3] 0.0-10.0 sec 113 MBytes 95.0 Mbits/sec
> to [ 3] 0.0-10.0 sec 75.7 MBytes 63.3 Mbits/sec
> with 2.6.23-rc1 (and 2.6.23-rc8), as measured with iperf.
>
> I did a git bisect today and tracked it back to the commit where CFS
> was enabled ("sched: cfs core code; apply the CFS core code",
> commit dd41f596cda0d7d6e4a8b139ffdfabcefdd46528). I also compiled a
> kernel from
> git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched-devel.git
> but things don't improve.
>
> This is on a Thecus N2100, an ARM (Intel IOP32x) based storage device
> with a r8169 card, SATA disks and 512 MB RAM. My config is attached.
>
> What kind of information can I supply so you can track this down?
I noticed on the iperf website a patch which contains sched_yield().
http://dast.nlanr.net/Projects/Iperf2.0/patch-iperf-linux-2.6.21.txt
Do you have that patch applied by any chance? If so, it might be a
worth while to try it without it.
-Mike
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