linux-kernel - Re: [Bug #11308] tbench regression on each kernel release from 2.6.22 -> 2.6.28

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Message-ID: <Pine.LNX.4.64.0811191341570.23502@quilx.com>
Date:	Wed, 19 Nov 2008 13:43:12 -0600 (CST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Mike Galbraith <efault@....de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [Bug #11308] tbench regression on each kernel release from 2.6.22
 -&gt; 2.6.28

On Mon, 17 Nov 2008, Ingo Molnar wrote:

> Christoph, as per the recent analysis of Mike:
>
>  http://fixunix.com/kernel/556867-regression-benchmark-throughput-loss-a622cf6-f7160c7-pull.html
>
> all scheduler components of this regression have been eliminated.
>
> In fact his numbers show that scheduler speedups since 2.6.22 have
> offset and hidden most other sources of tbench regression. (i.e. the
> scheduler portion got 5% faster, hence it was able to offset a
> slowdown of 5% in other areas of the kernel that tbench triggers)

Ok will rerun the tests tomorrow. Just got back from SC08 need some time
to catch up.

Looks like a lot of work was done on this issue. Thanks!

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