To: Jens Axboe <axboe@suse.de>
cc: linux-kernel@vger.kernel.org
Subject: Re: [cfq] sched_idle process stalled for 1 minute; strange ioprio too 
In-Reply-To: Your message of "Mon, 27 Mar 2006 10:49:36 +0200."
             <20060327084936.GF8186@suse.de> 
Date: Wed, 29 Mar 2006 14:20:20 +0100
From: Sanjoy Mahajan <sanjoy@mrao.cam.ac.uk>
Message-Id: <E1FOaay-0000Zs-00@skye.ra.phy.cam.ac.uk>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 738
Lines: 14

> Are you sure no other disk activity was going on at that time? Just
> a single writeout or read from the disk will stall your idle prio
> task. If you expect things to finish within a bounded time, then you
> should not use idle :-)

I'm not 100% sure.  The disk light never flashed.  And if any write or
read happened it would have been for just a moment, whereas the
apt-get stalled for about one minute.  I'll experiment again at the
next big 'apt-get upgrade' and report any long stalls.
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