From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Lameter <cl-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
Subject: Re: [Bug #11308] tbench regression on each kernel release from 2.6.22
 -&gt; 2.6.28
Date: Wed, 19 Nov 2008 13:43:12 -0600 (CST)
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To: Ingo Molnar <mingo-X9Un+BFzKDI@public.gmane.org>
Cc: "Rafael J. Wysocki" <rjw-KKrjLPT3xs0@public.gmane.org>, Linux Kernel Mailing List <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Kernel Testers List <kernel-testers-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Mike Galbraith <efault-Mmb7MZpHnFY@public.gmane.org>, Peter Zijlstra <a.p.zijlstra-/NLkJaSkS4VmR6Xm/wNWPw@public.gmane.org>

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!