linux-kernel - Re: [PATCH] Give kjournald a IOPRIO_CLASS

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Message-ID: <20081002061629.39d5e115@infradead.org>
Date:	Thu, 2 Oct 2008 06:16:29 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Theodore Tso <tytso@....edu>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	linux-kernel@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH] Give kjournald a IOPRIO_CLASS_RT io priority

On Thu, 2 Oct 2008 08:04:44 -0400
Theodore Tso <tytso@....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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