linux-kernel - Re: 2.6.21-mm1: many processes end up in D state

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Message-Id: <20070430110510.1f559d34.akpm@linux-foundation.org>
Date:	Mon, 30 Apr 2007 11:05:10 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jiri Slaby <jirislaby@...il.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.21-mm1: many processes end up in D state

On Mon, 30 Apr 2007 17:39:19 +0200
Jiri Slaby <jirislaby@...il.com> wrote:

> Hi,
> 
> I have a problem with higher disk loads (e.g. running git-log or yum update).
> Many processes end up in D state and system is unusable -- I'm not able to run
> anything but smooth mouse moving when this happens.
> 
> If I wait for a 20-30sec it becomes usable. This happens in 2.6.21-rc7-mm2 and
> also in 2007-04-28-05-06 broken-out snapshot. I think 2.6.21-rc6-mm1 worked
> fine, but I'm uncertain. If it is important, let me know to re-test.
> 

It is important, but I doubt if retesting 2.6.21-rc6-mm1 will clarify
things a lot.

Could you try switching to a different IO scheduler please?  Anticipatory
would suit.

Please keep a close eye on mainline, too.  Wait for it to appear there :(

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