Re: Performance regression in 2.6.22-git1 (new sched code?)

From: Andy Whitcroft
Date: Tue Jul 10 2007 - 15:21:03 EST


Martin Bligh wrote:
> ~ 1% on 4-way x86_64
>
> http://test.kernel.org/perf/kernbench.elm3b6.png
>
> ~ 4% on 16-way NUMA-Q (i386)
>
> http://test.kernel.org/perf/kernbench.moe.png
>
> ~ 1.5% on 4-way i386
>
> http://test.kernel.org/perf/kernbench.elm3b132.png
>
> There's readprofiles and stuff available from here:
> http://test.kernel.org/functional/index.html
> if you drill down under the tests marked "regression", eg.
> http://test.kernel.org/abat/98796/002.kernbench.test/profiling/profile.text

Ok, I've done a crude comparison of a bunch of the jobs we run between
2.6.22 and 2.6.22-git1 kernbench runs, extracting the wallclock, user
and system times for each. First column is 2.6.22, second is
2.6.22-git1, third is the delta. +ve bad, -ve good. Note that I have
hand correlated these jobs so error is possible, but it matches Martin's
figures I belive.

bl6-13
User 85.14 88.53 3.99
System 34.16 34.71 1.60
Total 119.30 123.24 3.30
elm3b132
User 2397.82 2431.95 1.42
System 207.41 206.78 -0.30
Total 2605.23 2638.73 1.29
elm3b6
User 352.18 357.18 1.42
System 37.06 36.61 -1.22
Total 389.24 393.79 1.17
oia5-hs20
User 645.02 653.47 1.31
System 49.30 52.45 6.37
Total 694.33 705.92 1.67
elm3b239
User 878.21 950.80 8.27
System 416.06 348.76 -16.18
Total 1294.27 1299.56 0.41

-apw
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