linux-kernel - Re: ext3 IO latency measurements (was: Linux 2.6.29)

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Message-ID: <20090326072707.5a98242d@infradead.org>
Date:	Thu, 26 Mar 2009 07:27:07 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Jan Kara <jack@...e.cz>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Theodore Tso <tytso@....edu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Nick Piggin <npiggin@...e.de>, David Rees <drees76@...il.com>,
	Jesper Krogh <jesper@...gh.cc>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Roland McGrath <roland@...hat.com>
Subject: Re: ext3 IO latency measurements (was: Linux 2.6.29)

On Thu, 26 Mar 2009 12:08:15 +0100
Jens Axboe <jens.axboe@...cle.com> wrote:
> 
> Did you capture the trace of the long delays in the read test case? It
> can be two things, at least. One is that each little read takes much
> longer than it should, the other is that we get stuck waiting on a
> dirty page and hence that slows down the reads a lot.
> 

would be interesting to run latencytop during such runs...


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
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