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    SubjectRe: Network slowdown due to CFS

    * Martin Michlmayr <tbm@cyrius.com> wrote:

    > * Mike Galbraith <efault@gmx.de> [2007-09-26 12:23]:
    > > 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.
    >
    > Yes, this patch was applied. When I revert it, I get the same (high)
    > performance with both kernels.

    great! Could you try this too:

    echo 1 > /proc/sys/kernel/sched_compat_yield

    does it fix iperf performance too (with the yield patch applied to
    iperf)?

    I think the real fix would be for iperf to use blocking network IO
    though, or maybe to use a POSIX mutex or POSIX semaphores.

    Ingo
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