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

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Message-ID: <84144f020903260522r78240128j3c7d4691b76b7257@mail.gmail.com>
Date:	Thu, 26 Mar 2009 14:22:27 +0200
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	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>,
	Arjan van de Ven <arjan@...radead.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Nick Piggin <npiggin@...e.de>,
	Jens Axboe <jens.axboe@...cle.com>,
	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)

Hi Ingo,

On Thu, Mar 26, 2009 at 11:06 AM, Ingo Molnar <mingo@...e.hu> wrote:
> Btw., i had this test going on that box while i wrote some simple
> scripts in Vim - and it was a horrible experience. The worst wait
> was well above one minute - Vim just hung there indefinitely. Not
> even Ctrl-Z was possible. I captured one such wait, it was hanging
> right here:

Just a data point: I've seen this exact same time for a long time (1-2
years) too even with stock distribution kernels. Never bothered to
investigate it though.

                        Pekka
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