linux-kernel - Re: dramatic I/O slowdown after upgrading 2.6.32->3.0

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Message-ID: <20120402105850.270fe7f2@lwn.net>
Date:	Mon, 2 Apr 2012 10:58:50 -0600
From:	Jonathan Corbet <corbet@....net>
To:	Michael Tokarev <mjt@....msk.ru>
Cc:	Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: dramatic I/O slowdown after upgrading 2.6.32->3.0

On Fri, 30 Mar 2012 20:50:54 +0400
Michael Tokarev <mjt@....msk.ru> wrote:

> I'm observing a dramatic slowdown of several hosts after upgrading
> from 2.6.32.y to 3.0.x i686 kernels (in both cases from kernel.org,
> on both cases the last version is relatively latest).
> 
> On 2.6.32 everything is fast.  On 3.0 the same operations which goes
> instantly takes ages to complete.
[...]
> What's the way to debug this issue?

There is a huge gap between those two kernels, so nobody is going to have
much luck guessing about what has changed.  A good first step might be to
do a binary search among the intermediate kernel releases to figure out
which one slowed things down for you.

jon
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