Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752693AbZC0AKa (ORCPT ); Thu, 26 Mar 2009 20:10:30 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932796AbZC0AJ7 (ORCPT ); Thu, 26 Mar 2009 20:09:59 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:35195 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932795AbZC0AJ6 (ORCPT ); Thu, 26 Mar 2009 20:09:58 -0400 Date: Fri, 27 Mar 2009 01:08:02 +0100 From: Ingo Molnar To: Theodore Tso , Jan Kara , Linus Torvalds , Andrew Morton , Alan Cox , Arjan van de Ven , Peter Zijlstra , Nick Piggin , Jens Axboe , David Rees , Jesper Krogh , Linux Kernel Mailing List , Oleg Nesterov , Roland McGrath Subject: Re: ext3 IO latency measurements (was: Linux 2.6.29) Message-ID: <20090327000802.GB28441@elte.hu> References: <20090325215137.GQ32307@mit.edu> <20090325235041.GA11024@duck.suse.cz> <20090326090630.GA9369@elte.hu> <20090326113705.GV32307@mit.edu> <20090326140312.GB14822@elte.hu> <20090326152815.GB6239@mit.edu> <20090326230240.GA18808@elte.hu> <20090326235936.GK6239@mit.edu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090326235936.GK6239@mit.edu> User-Agent: Mutt/1.5.18 (2008-05-17) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 873 Lines: 22 * Theodore Tso 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@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/