* Martin Michlmayr <[email protected]> wrote:
> * Mike Galbraith <[email protected]> [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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