Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753398Ab0H1MpN (ORCPT ); Sat, 28 Aug 2010 08:45:13 -0400 Received: from mail-vw0-f46.google.com ([209.85.212.46]:35225 "EHLO mail-vw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753344Ab0H1MpL (ORCPT ); Sat, 28 Aug 2010 08:45:11 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type; b=bt0ycQrZaGX8UCbMq8wu3p+obIxXUAy4r6kmkXkr+dK3qo1+vPqWDOvyWEV0etmNl5 Bxk40oqmXVKHUXLaeRP4L4zkmf6Q+ZelvxBTXTaWLkcG8lD42/jW3tqtN29HGToW/MY9 6uDJ8tO+uACX9Sv0hvMf6h2DxMNqAtmHaaxJ4= MIME-Version: 1.0 In-Reply-To: <1282957741.1946.27.camel@work-vm> References: <1282932708.1946.8.camel@work-vm> <1282957741.1946.27.camel@work-vm> Date: Sat, 28 Aug 2010 14:45:10 +0200 X-Google-Sender-Auth: cGtgFrYjM7cS7c8U6eapUa0LgJ4 Message-ID: Subject: Re: System time drifts when processor idle. From: jean-philippe francois To: john stultz Cc: Venkatesh Pallipadi , Lin Ming , "H. Peter Anvin" , linux-acpi@vger.kernel.org, LKML , jslaby@suse.cz Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1214 Lines: 38 2010/8/28 john stultz : >> > 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? >> > Yes, the problem usually show up quite quickly, and I think I have let my script run for a long enough time to say it does not occur with clock=acpi_pm >> > 2) Does booting with "nohz=off" cause the issue to disappear? >> > Not tested yet. > > jean-philippe: Is the drift always in 5 minute increments? Can you leave > it idle for 3 minutes and see a similar 3 minute delay, or is it always > in units of 5 ? > That is interesting ! I think I have always seen 5 minutes or multiples of this delay. I will try to leave it running for a longer period of time and come back to you with more results. If you look at the first message of this thread (on linux-acpi) the delay is first 5, then 10 minutes. Thank you for your interest. Jean-Philippe -- 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/