Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756477AbYKQJHc (ORCPT ); Mon, 17 Nov 2008 04:07:32 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750941AbYKQJHN (ORCPT ); Mon, 17 Nov 2008 04:07:13 -0500 Received: from mx3.mail.elte.hu ([157.181.1.138]:35726 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750783AbYKQJHK (ORCPT ); Mon, 17 Nov 2008 04:07:10 -0500 Date: Mon, 17 Nov 2008 10:06:48 +0100 From: Ingo Molnar To: "Rafael J. Wysocki" Cc: Linux Kernel Mailing List , Kernel Testers List , Christoph Lameter , Mike Galbraith , Peter Zijlstra Subject: Re: [Bug #11308] tbench regression on each kernel release from 2.6.22 -> 2.6.28 Message-ID: <20081117090648.GG28786@elte.hu> References: <1ScKicKnTUE.A.VxH.DIHIJB@chimera> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.18 (2008-05-17) 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,DNS_FROM_SECURITYSAGE autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] 0.0 DNS_FROM_SECURITYSAGE RBL: Envelope sender in blackholes.securitysage.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1470 Lines: 35 * Rafael J. Wysocki wrote: > This message has been generated automatically as a part of a report > of regressions introduced between 2.6.26 and 2.6.27. > > The following bug entry is on the current list of known regressions > introduced between 2.6.26 and 2.6.27. Please verify if it still should > be listed and let me know (either way). > > > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=11308 > Subject : tbench regression on each kernel release from 2.6.22 -> 2.6.28 > Submitter : Christoph Lameter > Date : 2008-08-11 18:36 (98 days old) > References : http://marc.info/?l=linux-kernel&m=121847986119495&w=4 > http://marc.info/?l=linux-kernel&m=122125737421332&w=4 Christoph, as per the recent analysis of Mike: http://fixunix.com/kernel/556867-regression-benchmark-throughput-loss-a622cf6-f7160c7-pull.html all scheduler components of this regression have been eliminated. In fact his numbers show that scheduler speedups since 2.6.22 have offset and hidden most other sources of tbench regression. (i.e. the scheduler portion got 5% faster, hence it was able to offset a slowdown of 5% in other areas of the kernel that tbench triggers) 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/