From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S940343AbXGaBHa (ORCPT ); Mon, 30 Jul 2007 21:07:30 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S937828AbXGaBHX (ORCPT ); Mon, 30 Jul 2007 21:07:23 -0400 Received: from an-out-0708.google.com ([209.85.132.245]:1486 "EHLO an-out-0708.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1763381AbXGaBHV (ORCPT ); Mon, 30 Jul 2007 21:07:21 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:sender:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references:x-google-sender-auth; b=dNxJ/+uSu7gjcfKaGo30n1/C1b5WJRX2UgmINX+zFTNRauLQar6ilgH/8GcL5j4ly6ULyEL4iT5DwC9k1CcdhmbWOV/vO7gYIZpfMgXrtrj3f/vLwCqYiF6NppsqM8pEG043/UEA70tm5KwcIJc7JHzcGrqqHwiWqprna7dUTlU= Message-ID: <1f1b08da0707301807h62a24b3o786beed607ae5fcd@mail.gmail.com> Date: Mon, 30 Jul 2007 18:07:19 -0700 From: "john stultz" To: "Vasily Averin" Subject: Re: [2.6.22] negative time jump Cc: lkml In-Reply-To: <1f1b08da0707301113r173adba0yd2585263e89fd8@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <46AD57BF.8090106@sw.ru> <1f1b08da0707301113r173adba0yd2585263e89fd8@mail.gmail.com> X-Google-Sender-Auth: be8cda38f6a08725 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Whoops, forgot to CC lkml. ---------- Forwarded message ---------- From: john stultz Date: Jul 30, 2007 11:13 AM Subject: Re: [2.6.22] negative time jump To: Vasily Averin On 7/29/07, Vasily Averin wrote: > I've investigated why my testnode freezes. When I found that node is freezed > again I've started to press Sysrq keys and noticed the following negative time jump. > > Could anybody please help me to understand the reasons of this issue? > > --- VvS comment: some pre-history: node boot > Jul 27 13:58:10 ts28 Linux version 2.6.22 (vvs@vvs.work.ve) (gcc version 3.4.6 > 20060404 (Red Hat 3.4.6-3)) #11 SMP Fri Jul 27 12:47:45 MSD 2007 > Jul 27 13:58:10 ts28 Command line: ro root=LABEL=/1 console=ttyS0,115200 > console=tty debug silencelevel=8 crashkernel=128M@128M acpc=noirq clocksource=tsc clocksource=tsc? I suspect you're forcing the clocksource as its not selected by default. Could you provide dmesg output without that option. It might shed some light as to why the clocksource isn't chosen. It may very well be your TSCs are not synched or are otherwise not reliable for timekeeping , and thus time is not consistent between cpus. -john PS: also, you might want to check that acpc=noirq bit as well.. i think you mean "acpi=noirq"