From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964952AbVJUNtu (ORCPT ); Fri, 21 Oct 2005 09:49:50 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S964953AbVJUNtu (ORCPT ); Fri, 21 Oct 2005 09:49:50 -0400 Received: from 213-239-205-147.clients.your-server.de ([213.239.205.147]:25279 "EHLO mail.tglx.de") by vger.kernel.org with ESMTP id S964952AbVJUNtt (ORCPT ); Fri, 21 Oct 2005 09:49:49 -0400 Subject: Re: False positive (well not really) on RT backward clock check From: Thomas Gleixner Reply-To: tglx@linutronix.de To: Steven Rostedt Cc: Ingo Molnar , linux-kernel@vger.kernel.org In-Reply-To: References: Content-Type: text/plain Organization: linutronix Date: Fri, 21 Oct 2005 15:52:21 +0200 Message-Id: <1129902741.15748.4.camel@tglx.tec.linutronix.de> Mime-Version: 1.0 X-Mailer: Evolution 2.2.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2005-10-21 at 09:45 -0400, Steven Rostedt wrote: > Ingo, > > Just want to let you know that I got the warning of the clock going > backwards on boot up. But it happened right after I got this message. > > Ktimers: Switched to high resolution mode CPU 0 > > So I'm assuming that the clock can go backwards by the switch to high res > timers. Can you provide the boot messages up to the switch please ? It's more likely that this is the switch of the clocksource from jiffies to TSC. The ktimers high res switch is done in this context. tglx