Re: io performance...

[Pekka Enberg]

Hi,

On 1/16/06, Max Waterman <davidmaxwaterman+kernel@xxxxxxxxxxxxxx> 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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