Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758796AbXIQUgX (ORCPT ); Mon, 17 Sep 2007 16:36:23 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755635AbXIQUgP (ORCPT ); Mon, 17 Sep 2007 16:36:15 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:44125 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755816AbXIQUgO (ORCPT ); Mon, 17 Sep 2007 16:36:14 -0400 Date: Mon, 17 Sep 2007 22:36:07 +0200 From: Ingo Molnar To: Rob Hussey Cc: linux-kernel@vger.kernel.org, ck@vds.kolivas.org Subject: Re: Scheduler benchmarks - a follow-up Message-ID: <20070917203607.GA20564@elte.hu> References: <6b8cef970709170221s4301e896x2ee123a149c05c3a@mail.gmail.com> <20070917130524.GA10707@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070917130524.GA10707@elte.hu> User-Agent: Mutt/1.5.14 (2007-02-12) 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=3.1.7-deb -1.5 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: 914 Lines: 21 * Ingo Molnar wrote: > i've meanwhile tested hackbench 90 and the performance difference > between -ck and -cfs-devel seems to be mostly down to the more precise > (but slower) sched_clock() introduced in v2.6.23 and to the startup > penalty of freshly created tasks. Rob, another thing i just noticed in your .configs: you have CONFIG_PREEMPT=y enabled. Would it be possible to get a testrun with that disabled? That gives the best throughput and context-switch latency numbers. (CONFIG_PREEMPT might also have preemption artifacts - there's one report of it having _worse_ desktop latencies on certain hardware than !CONFIG_PREEMPT.) 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/