Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758612AbZIQHVT (ORCPT ); Thu, 17 Sep 2009 03:21:19 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758557AbZIQHVT (ORCPT ); Thu, 17 Sep 2009 03:21:19 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:56678 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758488AbZIQHVS (ORCPT ); Thu, 17 Sep 2009 03:21:18 -0400 Date: Thu, 17 Sep 2009 09:21:17 +0200 From: Ingo Molnar To: Mike Galbraith Cc: Serge Belyshev , linux-kernel@vger.kernel.org, Peter Zijlstra Subject: Re: [patchlet] Re: Epic regression in throughput since v2.6.23 Message-ID: <20090917072117.GA17198@elte.hu> References: <20090909155223.GA12065@elte.hu> <87my53vo6d.fsf@depni.sinp.msu.ru> <20090910065306.GB3920@elte.hu> <87ljkm9yew.fsf@depni.sinp.msu.ru> <20090911061024.GA27833@elte.hu> <87iqfmx3tr.fsf@depni.sinp.msu.ru> <20090916194507.GA27456@elte.hu> <87fxamiim4.fsf@depni.sinp.msu.ru> <1253163339.15767.62.camel@marge.simson.net> <1253164000.15767.65.camel@marge.simson.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1253164000.15767.65.camel@marge.simson.net> User-Agent: Mutt/1.5.18 (2008-05-17) 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=3.2.5 -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 Content-Length: 1169 Lines: 29 here's some start-debit versus non-start-debit numbers. The workload: on a dual-core box start and kill 10 loops, once every second. PID 23137 is a shell doing interactive stuff. (running a loop of usleep 100000 and echo) START_DEBIT: europe:~> perf sched lat | grep 23137 bash:23137 | 34.380 ms | 187 | avg: 0.005 ms | max: 0.017 ms | bash:23137 | 36.410 ms | 188 | avg: 0.005 ms | max: 0.011 ms | bash:23137 | 36.680 ms | 183 | avg: 0.007 ms | max: 0.333 ms | NO_START_DEBIT: europe:~> perf sched lat | grep 23137 bash:23137 | 35.531 ms | 183 | avg: 0.005 ms | max: 0.019 ms | bash:23137 | 35.511 ms | 188 | avg: 0.007 ms | max: 0.334 ms | bash:23137 | 35.774 ms | 185 | avg: 0.005 ms | max: 0.019 ms | Seems very similar at first sight. 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/