Message-ID: <401490185.02675@ustc.edu.cn>
Date: Mon, 28 Jan 2008 11:16:06 +0800
From: Fengguang Wu <wfg@mail.ustc.edu.cn>
To: Sev Binello <sev@bnl.gov>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Many processes stuck in blk_congestion_wait
References: <4797BD62.1070608@bnl.gov>
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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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