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

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Date:	Tue, 10 Jul 2007 20:20:44 +0100
From:	Andy Whitcroft <apw@...dowen.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Martin Bligh <mbligh@...igh.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Performance regression in 2.6.22-git1 (new sched code?)

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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