Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755166Ab0H0SL5 (ORCPT ); Fri, 27 Aug 2010 14:11:57 -0400 Received: from e1.ny.us.ibm.com ([32.97.182.141]:52720 "EHLO e1.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751392Ab0H0SLz (ORCPT ); Fri, 27 Aug 2010 14:11:55 -0400 Subject: Re: System time drifts when processor idle. From: john stultz To: jean-philippe francois Cc: Lin Ming , venki@google.com, "H. Peter Anvin" , linux-acpi@vger.kernel.org, LKML , jslaby@suse.cz In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Date: Fri, 27 Aug 2010 11:11:48 -0700 Message-ID: <1282932708.1946.8.camel@work-vm> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 931 Lines: 31 On Fri, 2010-08-27 at 16:12 +0200, jean-philippe francois wrote: > My Timekeeping bug is still present, here is an updated script and log. > I am willing to make test, but I don't know what kind of debugging > info is needed. > > cat /sys/devices/system/clocksource/clocksource0/available_clocksource > hpet acpi_pm > cat /sys/devices/system/clocksource/clocksource0/current_clocksource > hpet Huh. hpet was not what I would have expected. So first, two experiments: 1) Does booting with "clock=acpi_pm" cause the issue to disappear? 2) Does booting with "nohz=off" cause the issue to disappear? Venkatesh: You have any experience with HPETs that halt in idle? thanks -john -- 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/