linux-kernel - Re: disk speed regression kernel 2.6.29 and after

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Date:	Wed, 23 Sep 2009 08:23:51 -0400
From:	Jon Smirl <jonsmirl@...il.com>
To:	whansard@...global.net
Cc:	linux-kernel@...r.kernel.org
Subject: Re: disk speed regression kernel 2.6.29 and after

On Wed, Sep 23, 2009 at 8:08 AM, will <whansard@...global.net> wrote:
> I had been using an old 2.6.22 kernel on my machine, and I often backup one
> partition of my main hard drive to a partition on a second hard drive. The
> main hard drive is sata 640 gigs, and the second is a pata 320 gig. copying
> this partition from one drive to the other with dd takes about 3 minutes and
> 30 seconds. When I installed kernel 2.6.30, and 2.6.31, the time took 9
> minutes and 20 seconds. I decided to go to the trouble of compiling all the
> kernels between, and kernels 2.6.22-2.6.28 all do the operation in about 3

Download the kernel source using git. Then use 'git bisect' to find
the exact commit that is causing problems.
'git bisect' does a binary search so it homes in on the problem commit quickly.

Once you know the exact commit it is much easier to find the problem.

> minutes and 30 seconds. 2.6.29- newer all take about 9 minutes and 20
> seconds. The partition is 16 gigs. each drive seems to be as fast as before
> otherwise, it's just much slower copying from one drive to another, which I
> do very often. This is an nforce 3 based motherboard, amd southbridge, i
> think, with 4 gigs of ram, athlon 64x2. 32 bit kernel. has anyone heard of
> this problem?
> I currently have 3  hard drives hooked up.
> a 200 gig on a promise controller,
> a 320 gig on the amd pata?
> a 640 sata on the nv i think.
> The motherboard is a Asrock-AM2NF3-VSTA
> copying this partition with dd or cat or schily's dd between any of these 3
> different hard drives takes different times depending on the speed of the
> drive with
> kernels 2.6.22-2.6.28, but takes about 9 minutes and 30 seconds on any of
> the drives
> with the kernels 2.6.29 and after.
> Please cc me with any followups or anything. thanks.
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-- 
Jon Smirl
jonsmirl@...il.com
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