Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750918AbXBMRKN (ORCPT ); Tue, 13 Feb 2007 12:10:13 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750921AbXBMRKN (ORCPT ); Tue, 13 Feb 2007 12:10:13 -0500 Received: from omx2-ext.sgi.com ([192.48.171.19]:60102 "EHLO omx2.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750918AbXBMRKM (ORCPT ); Tue, 13 Feb 2007 12:10:12 -0500 Date: Tue, 13 Feb 2007 09:09:13 -0800 (PST) From: Christoph Lameter To: Arjan van de Ven cc: Andi Kleen , Vojtech Pavlik , Jiri Bohac , linux-kernel@vger.kernel.org, ssouhlal@freebsd.org, tglx@linutronix.de, johnstul@us.ibm.com, zippel@linux-m68k.org, andrea@suse.de Subject: Re: [patch 4/9] Remove the TSC synchronization on SMP machines In-Reply-To: <1171348808.12771.19.camel@laptopd505.fenrus.org> Message-ID: References: <20070201095952.589234000@jet.suse.cz> <20070201131715.GM21755@dwarf.suse.cz> <20070201151654.GA20385@suse.cz> <200702020814.27378.ak@suse.de> <1171348808.12771.19.camel@laptopd505.fenrus.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 735 Lines: 15 On Tue, 13 Feb 2007, Arjan van de Ven wrote: > no quite the opposite. gettimeofday() currently is NOT monotonic > unfortunately. With this patchseries it actually has a better chance of > becoming that... It is monotonic on IA64 at least and we have found that subtle application bugs occur if it is not. IA64 (and other arches using time interpolation) can insure the monotoneity of time sources. Are you sure about this? I wonder why the new time of day subsystem does not have that? - 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/