Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755918AbYBYHlb (ORCPT ); Mon, 25 Feb 2008 02:41:31 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754703AbYBYHlM (ORCPT ); Mon, 25 Feb 2008 02:41:12 -0500 Received: from www.tglx.de ([62.245.132.106]:58164 "EHLO www.tglx.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754664AbYBYHlL (ORCPT ); Mon, 25 Feb 2008 02:41:11 -0500 Date: Mon, 25 Feb 2008 08:40:52 +0100 (CET) From: Thomas Gleixner To: Robert Hancock cc: Gabriel C , Linux Kernel Mailing List , Gabriel C Subject: Re: Clocksource tsc is always unstable with 2.6.25-* kernels and CONFIG_NO_HZ=y on my box In-Reply-To: <47C24517.7010204@shaw.ca> Message-ID: References: <47C24517.7010204@shaw.ca> User-Agent: Alpine 1.00 (LFD 882 2007-12-20) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1333 Lines: 45 On Sun, 24 Feb 2008, Robert Hancock wrote: > Gabriel C wrote: > > Hi, > > > > I noticed tsc is always marked unstable on my box with 2.6.25* , 2.6.24 is > > fine. > > > > .. > > > > [ 0.825760] ACPI: PCI Interrupt 0000:03:0e.0[A] -> GSI 22 (level, low) -> > > IRQ 22 > > [ 0.805755] Switched to high resolution mode on CPU 1 > > [ 0.794244] Switched to high resolution mode on CPU 2 > > [ 0.766968] Switched to high resolution mode on CPU 3 > > [ 1.083944] Switched to high resolution mode on CPU 0 > > [ 15.388792] Clocksource tsc unstable (delta = 9373391604 ns) Doh, this looks like the acpi_pm timer is not working at all. > > [ 15.714648] Time: acpi_pm clocksource has been installed. > > .. > > > > Booting nohz=off fixes that. > > > > Another strange thing is when I try to boot that kernel with > > clocksource=acpi_pm it just hangs. Which confirms the above. > > config is attached. > > > > Please let me know if you need more infos / want me to try patches or > > anything else. > > Please post your full dmesg output. Yes please. Thanks, tglx -- 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/