From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760134AbYA0WTg (ORCPT ); Sun, 27 Jan 2008 17:19:36 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756854AbYA0WT2 (ORCPT ); Sun, 27 Jan 2008 17:19:28 -0500 Received: from mx3.mail.elte.hu ([157.181.1.138]:48321 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754466AbYA0WT1 (ORCPT ); Sun, 27 Jan 2008 17:19:27 -0500 Date: Sun, 27 Jan 2008 23:19:16 +0100 From: Ingo Molnar To: "Benjamin K. Stuhl" Cc: Peter Zijlstra , Thomas Gleixner , Linux-Kernel Mailing List Subject: Re: "sched: add vslice" causes horrible interactivity under load Message-ID: <20080127221916.GA18482@elte.hu> References: <20080127144400.78e0aec5@colorado.edu> <20080127221422.GA17085@elte.hu> <20080127221702.GA18151@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080127221702.GA18151@elte.hu> 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 * Ingo Molnar wrote: > > while such delays are happening? Please enable CONFIG_SCHED_DEBUG=y > > and CONFIG_SCHEDSTATS=y as well before doing the dump. Also please > > send your .config. > > another thing that might make a difference is to disable (or enable) > the CONFIG_FAIR_GROUP_SCHED feature in the .config. yet another thing to tune would be to decrease the value of /proc/sys/kernel/sched_latency, and/or to subtract '4' from the value of /proc/sys/kernel/sched_features. [it defaults to 7 in v2.6.24] Ingo