Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1031693AbXEDVDp (ORCPT ); Fri, 4 May 2007 17:03:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1031701AbXEDVDp (ORCPT ); Fri, 4 May 2007 17:03:45 -0400 Received: from mailer.gwdg.de ([134.76.10.26]:40233 "EHLO mailer.gwdg.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1031693AbXEDVDo (ORCPT ); Fri, 4 May 2007 17:03:44 -0400 Date: Fri, 4 May 2007 23:02:07 +0200 (MEST) From: Jan Engelhardt To: john stultz cc: davej@codemonkey.org.uk, Linux Kernel Mailing List , cpufreq@lists.linux.org.uk Subject: Re: cpufreq longhaul locks up In-Reply-To: <1178311052.6094.0.camel@localhost.localdomain> Message-ID: References: <1178311052.6094.0.camel@localhost.localdomain> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Spam-Report: Content analysis: 0.0 points, 6.0 required _SUMMARY_ Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1392 Lines: 38 On May 4 2007 13:37, john stultz wrote: >> >> I found that setting the cpufreq governor to ondemand making the box >> lock up solid in 2.6.20.2 and 2.6.21 after a few seconds. Sysrq >> does not work anymore, and the last messages are: >> >> May 3 19:16:58 cn kernel: longhaul: VIA C3 'Nehemiah C' [C5P] CPU >> detected. Powersaver supported. >> May 3 19:16:58 cn kernel: longhaul: Using northbridge support. >> May 3 19:17:22 cn kernel: Time: acpi_pm clocksource has been installed. >> May 3 19:17:22 cn kernel: Clocksource tsc unstable (delta = -136422685 >> ns) > >What happens if you boot wihtout the ondemand governor but w/ >clocksource=acpi_pm ? I always let it boot with the default gov (performance), then use cpufreq-set to change it. acpi_pm+performance behaves like tsc+performance, which works When switching from tsc+performance to (tsc+)ondemand, acpi_pm gets used because of the unstable tsc (of course, since we changed frequency and the cpu does NOT have constant_tsc), so it's becoming acpi_pm+ondemand naturally. Switching from acpi_pm+performance to acpi_pm+ondemand also locks up after a few minutes. Jan -- - 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/