Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751848AbaLCU4Q (ORCPT ); Wed, 3 Dec 2014 15:56:16 -0500 Received: from www.linutronix.de ([62.245.132.108]:55597 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750707AbaLCU4O (ORCPT ); Wed, 3 Dec 2014 15:56:14 -0500 Date: Wed, 3 Dec 2014 21:55:57 +0100 (CET) From: Thomas Gleixner To: Linus Torvalds cc: Dave Jones , Chris Mason , Mike Galbraith , Ingo Molnar , Peter Zijlstra , =?ISO-8859-15?Q?D=E2niel_Fraga?= , Sasha Levin , "Paul E. McKenney" , Linux Kernel Mailing List , John Stultz Subject: Re: frequent lockups in 3.18rc4 In-Reply-To: Message-ID: References: <20141201230339.GA20487@ret.masoncoding.com> <1417529606.3924.26.camel@maggy.simpson.net> <1417540493.21136.3@mail.thefacebook.com> <20141203184111.GA32005@redhat.com> <20141203190045.GB32005@redhat.com> <20141203200906.GA3118@redhat.com> User-Agent: Alpine 2.11 (DEB 23 2013-08-11) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 3 Dec 2014, Linus Torvalds wrote: > On Wed, Dec 3, 2014 at 12:09 PM, Dave Jones wrote: > > > > fwiw, there's quite a bit of variance in the delta that seems to show up. > > Yeah, anything from 1 to 251 seconds. That's definitely "quite a bit > of variance" But it's always negative, which means HPET is always ahead of TSC. That excludes pretty much the clocksource watchdog starvation issue which results in TSC being ahead of HPET due to a HPET wraparound (which takes ~300s). Thanks, tglx -- 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/