Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933024AbYB2P6P (ORCPT ); Fri, 29 Feb 2008 10:58:15 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756370AbYB2P6A (ORCPT ); Fri, 29 Feb 2008 10:58:00 -0500 Received: from mx2.mail.elte.hu ([157.181.151.9]:46044 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755509AbYB2P57 (ORCPT ); Fri, 29 Feb 2008 10:57:59 -0500 Date: Fri, 29 Feb 2008 16:57:41 +0100 From: Ingo Molnar To: Ray Lee Cc: "Carlos R. Mafra" , kernel list , Arjan van de Ven Subject: Re: Interactivity issue in 2.6.25-rc3 Message-ID: <20080229155741.GF27248@elte.hu> References: <20080228184407.GA7117@localhost.ift.unesp.br> <20080228191824.GA20019@elte.hu> <2c0942db0802281154y3176e847g8b9a4091df5cc8af@mail.gmail.com> <20080228210627.GA4337@localhost.ift.unesp.br> <2c0942db0802281328y276d110cqbcc9cfe92f0c6832@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <2c0942db0802281328y276d110cqbcc9cfe92f0c6832@mail.gmail.com> User-Agent: Mutt/1.5.17 (2007-11-01) 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: 1189 Lines: 26 * Ray Lee wrote: > But it's good to keep in mind that the scheduler can't do anything > about slowdowns due to tasks being swapped out or waiting on reads > from the disk. I mention this as shortly after CFS got into mainline, > something changed in the VM that seems to make my system spend a lot > more time in IO wait, causing the system to be much less responsive > than it used to be. > > Unfortunately it seems to be dependent upon the history of what tasks > I've run and their memory usage, so it's been hard to come up with a > reproducible test case (well that and a complete lack of time). All I > can say is that I've seen what you've reported as well, though it had > nothing to do with using any 3d applications, just a browser, editor, > gcc, etc. what does latencytop say about those delays, what causes them? It should be able to capture all sorts of latency sources in the system. 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/