Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761972AbXETGjM (ORCPT ); Sun, 20 May 2007 02:39:12 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759377AbXETGi7 (ORCPT ); Sun, 20 May 2007 02:38:59 -0400 Received: from mx2.mail.elte.hu ([157.181.151.9]:55066 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759342AbXETGi6 (ORCPT ); Sun, 20 May 2007 02:38:58 -0400 Date: Sun, 20 May 2007 08:38:04 +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: <20070520063804.GA25058@elte.hu> References: <20070517174533.GA538@elte.hu> <200705180317.06014.kernel@prachanda.hub> <20070518102607.GA23151@elte.hu> <200705200246.22444.kernel@prachanda.hub> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200705200246.22444.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: 1668 Lines: 41 * Anant Nitya wrote: > Hi Ingo, > > Please ignore my last report about lag problem while using CFS-v13, it > is working perfectly fine with 2.6.21.1 and the lag I used to see in > v12 is not there with v13 anymore. [...] ah, great - i was looking over your debug data and couldnt find the problem! This moves CFS into the "no open regressions" state again ;-) > [...] After digging in a bit I found that problem is only occurring in > 2.6.22-rc1 and it get fired by network usage while transmitting data > upstream. I don't have any evidence that CFS is involved in lag > problem since 2.6.22-rc1 with stock scheduler is also having same lag > problem and it seems directly proportional with upstream speed while > downstream doesn't shows any misbehavior { at lower upstream speed lag > is less but with higher upstream speed system starts crawling and > system load hitting to 70/75}. Lets see how 2.6.22-rc2 is doing. if that lag still occurs with rc2 then please repeat the following debugging steps under CFS [which has more instrumentation than the stock scheduler]: cat /proc/`pidof firefox-bin`/sched > sched1.txt echo 0 > /proc/`pidof firefox-bin`/sched < reproduce the lag in firefox > cat /proc/`pidof firefox-bin`/sched > sched2.txt this way we'll be able to tell what nature this delay has. Also, could you send me your kernel's .config (off-list)? 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/