Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760290AbXERK13 (ORCPT ); Fri, 18 May 2007 06:27:29 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754726AbXERK1W (ORCPT ); Fri, 18 May 2007 06:27:22 -0400 Received: from mx2.mail.elte.hu ([157.181.151.9]:51138 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754856AbXERK1V (ORCPT ); Fri, 18 May 2007 06:27:21 -0400 Date: Fri, 18 May 2007 12:26:07 +0200 From: Ingo Molnar To: Anant Nitya Cc: linux-kernel@vger.kernel.org, Linus Torvalds , Andrew Morton , Con Kolivas , Nick Piggin , Mike Galbraith , Peter Williams , Arjan van de Ven , Thomas Gleixner Subject: Re: [patch] CFS scheduler, -v13 Message-ID: <20070518102607.GA23151@elte.hu> References: <20070517174533.GA538@elte.hu> <200705180317.06014.kernel@prachanda.hub> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200705180317.06014.kernel@prachanda.hub> User-Agent: Mutt/1.4.2.2i X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -0.7 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-0.7 required=5.9 tests=BAYES_00,INFO_TLD autolearn=no SpamAssassin version=3.1.7 1.3 INFO_TLD URI: Contains an URL in the INFO top-level domain -2.0 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1722 Lines: 45 * Anant Nitya wrote: > Hi > > Been testing this version of CFS from last an hour or so and still > facing same lag problems while browsing sites with heavy JS and or > flash usage. Mouse movement is pathetic and audio starts to skip. I > haven't face this behavior with CFS till v11. i have just tried 5 different versions of the Flash plugin and i cannot reproduce this (flash games are still smooth and acceptable even with the system significantly overloaded with 5 infite loops or with a kernel build), so it would be nice if you could help me debug this problem. The last version that worked for you was v11, correct? The biggest v11 -> v12 change was the yield workaround, and while testing your workload i also noticed that all Flash versions except the latest one (9.0 r31) use sys_sched_yield() quite frequently. So it would be nice to know which plugin version you are using (and which Firefox version): you can check that by typing about:plugins into firefox. Furthermore, could you also try the following tune: echo 0 > /proc/sys/kernel/sched_yield_bug_workaround and this: echo 2 > /proc/sys/kernel/sched_yield_bug_workaround if none of this changes behavior then please send me the output of the following: strace -ttt -TTT -o strace.txt -f -p `pidof firefox-bin` < reproduce the lag in firefox > < Ctrl-C the strace > and send me the strace.txt file (off-line, it's going to be large). Thanks, 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/