Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932855AbXK2UVR (ORCPT ); Thu, 29 Nov 2007 15:21:17 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932868AbXK2UUz (ORCPT ); Thu, 29 Nov 2007 15:20:55 -0500 Received: from mfe1.polimi.it ([131.175.12.23]:60680 "EHLO polimi.it" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S932085AbXK2UUy (ORCPT ); Thu, 29 Nov 2007 15:20:54 -0500 Date: Thu, 29 Nov 2007 21:12:40 +0100 From: Stefano Brivio To: Ingo Molnar Cc: Dave Jones , "Rafael J. Wysocki" , linux-kernel@vger.kernel.org, Michael Buesch , Thomas Gleixner , Andrew Morton , Len Brown Subject: Re: [BUG] jiffies counter leaps in 2.6.24-rc3 Message-ID: <20071129211240.007fb459@morte> In-Reply-To: <20071129193624.GA15245@elte.hu> References: <20071124175112.58193424@morte> <200711241948.58881.rjw@sisk.pl> <20071124194635.58f5a44b@morte> <200711242031.26134.rjw@sisk.pl> <20071129095034.24b3fc59@morte> <20071129103511.GD10577@elte.hu> <20071129174548.GC12481@redhat.com> <20071129185743.46daa8ad@morte> <20071129182402.GE12481@redhat.com> <20071129202546.7a65a13c@morte> <20071129193624.GA15245@elte.hu> X-Mailer: Claws Mail 3.0.2 (GTK+ 2.12.1; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-PMX-Version: 5.3.3.310218, Antispam-Engine: 2.5.2.311128, Antispam-Data: 2007.11.6.30824 X-PerlMx-Spam: Gauge=II, Probability=22%, Report='RELAY_IN_PBL_11 2.5, RDNS_GENERIC_POOLED 0, RDNS_SUSP 0, RDNS_SUSP_GENERIC 0, RELAY_IN_PBL 0, __CT 0, __CTE 0, __CT_TEXT_PLAIN 0, __HAS_MSGID 0, __HAS_X_MAILER 0, __MIME_TEXT_ONLY 0, __MIME_VERSION 0, __SANE_MSGID 0' Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1263 Lines: 37 On Thu, 29 Nov 2007 20:36:24 +0100 Ingo Molnar wrote: > just to make sure there is no tsc impact, does booting with "notsc" > change anything? No, it doesn't. > if not, does booting with idle=halt or idle=poll help? [your power usage > will go up so it's not very useful - but it could help exclude a few > sources of trouble.] With idle=poll nothing changes, except that - as soon as I switch the CPU frequency - I get this in the logs: [ 297.562722] Marking TSC unstable due to: cpufreq changes. [ 297.566677] Time: acpi_pm clocksource has been installed. With idle=halt, changing frequency just freezes the system. I can't even use the magic Sys Rq keys then. I observed another thing. When I don't use any of the parameters you suggested for debugging, I get this at boot: [ 6.530752] Marking TSC unstable due to: possible TSC halt in C2. [ 6.530761] Time: acpi_pm clocksource has been installed. [ 6.620700] Clocksource tsc unstable (delta = -456217276 ns) -- Ciao Stefano - 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/