From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1764025AbYEFNL0 (ORCPT ); Tue, 6 May 2008 09:11:26 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756772AbYEFNLO (ORCPT ); Tue, 6 May 2008 09:11:14 -0400 Received: from mx2.mail.elte.hu ([157.181.151.9]:54244 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756511AbYEFNLN (ORCPT ); Tue, 6 May 2008 09:11:13 -0400 Date: Tue, 6 May 2008 15:11:00 +0200 From: Ingo Molnar To: =?iso-8859-1?Q?J=2EA=2E_Magall=F3n?= Cc: Linux-Kernel , Linus Torvalds Subject: Re: Scheduling problems ? [ Was: Linux 2.6.26-rc1 ] Message-ID: <20080506131100.GC2146@elte.hu> References: <20080506080712.5aab6d97@werewolf.home> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20080506080712.5aab6d97@werewolf.home> 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 * J.A. Magallón wrote: > Hi... > > I have installed this kernel, and it behaves a bit strange. > > If I launch a movie under totem, it plays nicely (no HD, just > 512x384). If then I start deluge with some torrents downloading, the > video begins to loose frames and jump, like loosing 1 or 2 frames per > second. There is not much bandwidth used, just 15-20 Kb. > > I have tried the same copying a kernel source tree and the video plays > fine. So can it be something network related, os network+io to disk ? > > No group scheduling, 1000Hz, fully preemptive kernel. If you smell > something and need my .config I will post it. could you try latest -git (head v2.6.26-rc1-110-ga153063 or later). There's scheduler interactivity fixes in it: in particular the fair-sleepers latency bug was finally tracked down and fixed via v2.6.26-rc1-66-ga992241 ("sched: fix normalized sleeper"). In v2.6.25 we didnt find that bug in time - see v2.6.25-rc9-1-ge2df9e0 ('revert "sched: fix fair sleepers"'). Ingo