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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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