Date: Thu, 2 Oct 2008 06:16:29 -0700
From: Arjan van de Ven <arjan@infradead.org>
To: Theodore Tso <tytso@mit.edu>
Cc: Andrew Morton <akpm@linux-foundation.org>,
       Jens Axboe <jens.axboe@oracle.com>, linux-kernel@vger.kernel.org,
       Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: [PATCH] Give kjournald a IOPRIO_CLASS_RT io priority
Message-ID: <20081002061629.39d5e115@infradead.org>
In-Reply-To: <20081002120444.GA25164@mit.edu>
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	<20081001215638.3a65134c.akpm@linux-foundation.org>
	<20081002062736.GR19428@kernel.dk>
	<20081001235501.2b7f50fe.akpm@linux-foundation.org>
	<20081002074523.GW19428@kernel.dk>
	<20081002010315.1cda8147.akpm@linux-foundation.org>
	<20081002120444.GA25164@mit.edu>
Organization: Intel
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On Thu, 2 Oct 2008 08:04:44 -0400
Theodore Tso <tytso@mit.edu> wrote:

> 
> > But sometimes that doesn't work (including the place where I
> > knowingly broke it).  If we can find and fix the offending piece of
> > jbd logic (a big if) then all is peachy.
> 
> Do we have workloads that can easily demonstrate this problem?  If so,
> we can add some tracing code which will allow us to see which theory
> is correct, and what is actually happening.

I can very easily reproduce it; my mail client (claws) stalls due to
this several seconds at least once every 5 to 10 minutes...
(usually when I'm typing an email.. grumble)


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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