Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754101AbYKQTxy (ORCPT ); Mon, 17 Nov 2008 14:53:54 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751479AbYKQTxp (ORCPT ); Mon, 17 Nov 2008 14:53:45 -0500 Received: from mx2.mail.elte.hu ([157.181.151.9]:42716 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751331AbYKQTxo (ORCPT ); Mon, 17 Nov 2008 14:53:44 -0500 Date: Mon, 17 Nov 2008 20:53:16 +0100 From: Ingo Molnar To: Linus Torvalds Cc: David Miller , dada1@cosmosbay.com, rjw@sisk.pl, linux-kernel@vger.kernel.org, kernel-testers@vger.kernel.org, cl@linux-foundation.org, efault@gmx.de, a.p.zijlstra@chello.nl Subject: Re: [Bug #11308] tbench regression on each kernel release from 2.6.22 -> 2.6.28 Message-ID: <20081117195316.GA8235@elte.hu> References: <20081117110119.GL28786@elte.hu> <4921539B.2000002@cosmosbay.com> <20081117161135.GE12081@elte.hu> <20081117.113158.200497613.davem@davemloft.net> 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: 1384 Lines: 40 * Linus Torvalds wrote: > On Mon, 17 Nov 2008, David Miller wrote: > > > > The scheduler has accounted for at least %10 of the tbench > > regressions at this point, what are you talking about? > > I'm wondering if you're not looking at totally different issues. > > For example, if I recall correctly, David had a big hit on the > hrtimers. And I wonder if perhaps Ingo's numbers are without > hrtimers or something? hrtimers should not be an issue anymore since this commit: | commit 0c4b83da58ec2e96ce9c44c211d6eac5f9dae478 | Author: Ingo Molnar | Date: Mon Oct 20 14:27:43 2008 +0200 | | sched: disable the hrtick for now | | David Miller reported that hrtick update overhead has tripled the | wakeup overhead on Sparc64. | | That is too much - disable the HRTICK feature for now by default, | until a faster implementation is found. | | Reported-by: David Miller | Acked-by: Peter Zijlstra | Signed-off-by: Ingo Molnar Which was included in v2.6.28-rc1 already. 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/