Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753573AbYKWQdF (ORCPT ); Sun, 23 Nov 2008 11:33:05 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750871AbYKWQcy (ORCPT ); Sun, 23 Nov 2008 11:32:54 -0500 Received: from mx3.mail.elte.hu ([157.181.1.138]:48777 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750767AbYKWQcx (ORCPT ); Sun, 23 Nov 2008 11:32:53 -0500 Date: Sun, 23 Nov 2008 17:32:40 +0100 From: Ingo Molnar To: Frans Pop Cc: "Rafael J. Wysocki" , Linux Kernel Mailing List , Kernel Testers List , Thomas Gleixner Subject: Re: [Bug #12064] [regression] Measured 688 cycles TSC warp; marking TSC unstable Message-ID: <20081123163240.GA5884@elte.hu> References: <200811231729.59256.elendil@planet.nl> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200811231729.59256.elendil@planet.nl> 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 autolearn=no SpamAssassin version=3.2.3 -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: 1331 Lines: 35 * Frans Pop wrote: > On Saturday 22 November 2008, Rafael J. Wysocki wrote: > > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=12064 > > Date : 2008-11-16 19:27:43 (7 days old) > > References : http://marc.info/?l=linux-kernel&m=122686370308852&w=2 > > Looks to be fixed in -rc6: > > -Calibrating delay using timer specific routine.. 6198.05 BogoMIPS (lpj=12396107) > +Calibrating delay using timer specific routine.. 6399.82 BogoMIPS (lpj=12799647) > [...] > -checking TSC synchronization [CPU#0 -> CPU#1]: > -Measured 696 cycles TSC warp between CPUs, turning off TSC clock. > -Marking TSC unstable due to check_tsc_sync_source failed > +checking TSC synchronization [CPU#0 -> CPU#1]: passed. > > So, BogoMIPS value on CPU#1 is in line with CPU#0 again and TSC passes. > No idea what commit would be responsible. this one from Venki fixed it: | commit 93ce99e849433ede4ce8b410b749dc0cad1100b2 | Author: Venki Pallipadi | Date: Mon Nov 17 14:43:58 2008 -0800 | | x86: add rdtsc barrier to TSC sync check 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/