From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1946088AbXD3QV3 (ORCPT ); Mon, 30 Apr 2007 12:21:29 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1946307AbXD3QV2 (ORCPT ); Mon, 30 Apr 2007 12:21:28 -0400 Received: from www.osadl.org ([213.239.205.134]:54067 "EHLO mail.tglx.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1946306AbXD3QVX (ORCPT ); Mon, 30 Apr 2007 12:21:23 -0400 Subject: Re: Linux 2.6.21: pmtmr losing time From: Thomas Gleixner Reply-To: tglx@linutronix.de To: Joerg Sommrey Cc: Linux kernel mailing list In-Reply-To: <20070430125200.GA5379@sommrey.de> References: <20070430125200.GA5379@sommrey.de> Content-Type: text/plain Date: Mon, 30 Apr 2007 18:23:36 +0200 Message-Id: <1177950216.5791.241.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.6.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2007-04-30 at 14:52 +0200, Joerg Sommrey wrote: > Hi all, > > after switching to 2.6.21 the system clock sporadically loses time on my > box (i386, Athlon MP). > It's always around 4.68 seconds and happened 7 times in the last 12 > hours. A simple calculation (2 ^ ACPI_PM_MASK / PMTMR_TICKS_PER_SEC = > 2 ^ 24 / 3579545 = 4.686968875) shows: There is almost exactly one > pmtmr-cycle missing. Could this be caused by a pmtmr-wrap when the > system is in a sleep state? Hmm, looks like. That's strange we don't sleep 4.68 seconds. Can you provide me the output of /proc/timer_list please ? tglx