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

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Date:	Wed, 19 Nov 2008 21:14:44 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Christoph Lameter <cl@...ux-foundation.org>
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


* Christoph Lameter <cl@...ux-foundation.org> wrote:

> 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!

You might also want to try net-next:

 [remote "net-next"]
        url = git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6.git
        fetch = +refs/heads/*:refs/remotes/net-next/*

Some good stuff is in there too, impacting this workload.

	Ingo
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