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Message-ID: <84144f020601160035y1ac037b2kfdc2ff4be5bacd79@mail.gmail.com>
Date: Mon, 16 Jan 2006 10:35:38 +0200
From: Pekka Enberg <penberg@cs.helsinki.fi>
To: Max Waterman <davidmaxwaterman+kernel@fastmail.co.uk>
Subject: Re: io performance...
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <43CB4CC3.4030904@fastmail.co.uk>
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Hi,

On 1/16/06, Max Waterman <davidmaxwaterman+kernel@fastmail.co.uk> wrote:
> I've noticed that I consistently get better (read) numbers from kernel 2.6.8
> than from later kernels.

[snip]

> The later kernels I've been using are :
>
> 2.6.12-1-686-smp
> 2.6.14-2-686-smp
> 2.6.15-1-686-smp
>
> The kernel which gives us the best results is :
>
> 2.6.8-2-386
>
> Any ideas to why this might be? Any other advice/help?

It would be helpful if you could isolate the exact changeset that
introduces the regression. You can use git bisect for that. Please
refer to the following URL for details:
http://www.kernel.org/pub/software/scm/git/docs/howto/isolate-bugs-with-bisect.txt

Also note that changeset for pre 2.6.11-rc2 kernels are in
old-2.6-bkcvs git tree. If you are new to git, you can find a good
introduction here: http://linux.yyz.us/git-howto.html. Thanks.

                               Pekka
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