Re: [announce] [patch] Voluntary Kernel Preemption Patch

Con Kolivas
2004-07-10T16:18:46Z

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Con Kolivas wrote:
> I've conducted some of the old fashioned Benno's latency test on this
> patch in various sysctl configurations. This was done on top of a
> different tree but everything else was kept static. I have to preface
> these results by saying I don't really get the 50ms size latencies
> normally but I'm usually unable to get better than 3ms so I wasn't sure
> what to expect.
>
> Only the both preempt off showed any "outlying" results with one spike
> of ~20ms but the rest of the time being ~3ms. Enabling both forms of
> preempt seemed to help a little but nothing drastic, and never below
> 1ms. It was not universal that the latencies were better, but there was
> a trend towards better latency. I suspect that those who are getting
> huge latencies may see a bigger change with this patch than I did.
>
> http://ck.kolivas.org/latency/
>
> Con

Ooops forgot to mention this was running reiserFS 3.6 on software raid0
2x IDE with cfq elevator.

Con

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