Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762105AbXEYIlj (ORCPT ); Fri, 25 May 2007 04:41:39 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753458AbXEYIlb (ORCPT ); Fri, 25 May 2007 04:41:31 -0400 Received: from mx2.mail.elte.hu ([157.181.151.9]:39600 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758658AbXEYIla (ORCPT ); Fri, 25 May 2007 04:41:30 -0400 Date: Fri, 25 May 2007 10:41:15 +0200 From: Ingo Molnar To: William Lee Irwin III Cc: Andi Kleen , Satyam Sharma , Andrew Morton , linux-kernel@vger.kernel.org, Peter Zijlstra Subject: Re: [patch] i386, numaq: enable TSCs again Message-ID: <20070525084115.GA29077@elte.hu> References: <20070525073158.GB8094@one.firstfloor.org> <20070525073957.GA15207@elte.hu> <20070525074316.GA16821@elte.hu> <20070525074915.GA18400@elte.hu> <20070525075446.GA20140@elte.hu> <20070525080827.GA22399@elte.hu> <20070525081944.GZ31925@holomorphy.com> <20070525083153.GA27236@elte.hu> <20070525083813.GA19966@holomorphy.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070525083813.GA19966@holomorphy.com> User-Agent: Mutt/1.4.2.2i X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -2.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-2.0 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.0.3 -2.0 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: 967 Lines: 22 * William Lee Irwin III wrote: > > yes, that's what i meant under 'slightly async'. Some AMD CPUs are > > like that too and sched_clock() now handles that fine. So we should > > try my patch. > > Sorry, then. I took slight to mean something else. In any event I was > only quantifying things. I've no opinion whatsoever on the impact of > the code on NUMA-Q, only some recall of its operating characteristics. there's no need to apologize at all! Thanks for reminding us about the time-scale and nature of the TSC drift on NUMAQ. I was worried that maybe the TSC was totally unusable for some reason - but that's fortunately not the case. So we now have one quirk less, hopefully :-) 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/