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

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Message-ID: <20090327000802.GB28441@elte.hu>
Date:	Fri, 27 Mar 2009 01:08:02 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Theodore Tso <tytso@....edu>, Jan Kara <jack@...e.cz>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	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)


* Theodore Tso <tytso@....edu> wrote:

> On Fri, Mar 27, 2009 at 12:02:40AM +0100, Ingo Molnar wrote:
> > This isnt me streaming gigs of data in and out of the system 
> > dirtying 90% of all RAM. This is a trivial workload barely 
> > scratching the RAM and CPU capabilities of the system.
> 
> Have you tried with maxcpus set to say, 2?  My guess is you won't see
> the problems in that case.

Note, my previous devel box was a single socket quad and it had such 
delays all the time as well. Havent tried it on a dual-core. (i dont 
have dual-core systems with enough RAM to be able to build a kernel 
purely in RAM)

	Ingo
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