linux-kernel - Re: Many processes stuck in blk_congestion

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Message-Id: <E1JJKTe-0001Ha-Mr@localhost.localdomain>
Date:	Mon, 28 Jan 2008 11:16:06 +0800
From:	Fengguang Wu <wfg@...l.ustc.edu.cn>
To:	Sev Binello <sev@....gov>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Many processes stuck in blk_congestion_wait

On Wed, Jan 23, 2008 at 05:19:14PM -0500, Sev Binello wrote:
> We are experiencing numerous hangs/slow downs on our WS4 U5 nfs client 
> machines (not seen on WS3).
> Many processes end up in a D state for long periods of time
> and are in  blk_congestion_wait().
> 
> Time in this state can vary,
> not sure what triggers them to come out, some don't
> But time in this state can be quite lengthy.

> Machines are running 2.6.9-55.0.9.ELsmp

It's a pretty old kernel.  If possible, a kernel upgrade may well fix
your problem.

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