From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932087AbcF3InN (ORCPT ); Thu, 30 Jun 2016 04:43:13 -0400 Received: from www.linutronix.de ([62.245.132.108]:45721 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751735AbcF3InK (ORCPT ); Thu, 30 Jun 2016 04:43:10 -0400 Date: Thu, 30 Jun 2016 10:40:47 +0200 (CEST) From: Thomas Gleixner To: Borislav Petkov cc: Peter Zijlstra , x86-ml , lkml Subject: Re: rc5+tip/master: Marking clocksource 'tsc' as unstable because the skew is too large: In-Reply-To: <20160629171619.GA3691@pd.tnic> Message-ID: References: <20160627200631.GA3678@pd.tnic> <20160629171619.GA3691@pd.tnic> 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, 29 Jun 2016, Borislav Petkov wrote: > On Mon, Jun 27, 2016 at 10:06:31PM +0200, Borislav Petkov wrote: > > Hey Thomas, > > > > Just started seeing this now during testing of Rafael's s/r fix: > > > > [ 24.973955] clocksource: timekeeping watchdog on CPU3: Marking clocksource 'tsc' as unstable because the skew is too large: > > [ 24.987744] clocksource: 'acpi_pm' wd_now: 2df835 wd_last: a6bb64 mask: ffffff > > [ 24.999587] clocksource: 'tsc' cs_now: 2bbe793d1e cs_last: 296e28763c mask: ffffffffffffffff > > [ 25.013400] clocksource: Switched to clocksource acpi_pm > > > > In the previous boot it was CPU1. > > And here it is again: > > ... > [ 15.720833] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready > [ 32.883077] clocksource: timekeeping watchdog on CPU1: Marking clocksource 'tsc' as unstable because the skew is too large: > [ 32.896986] clocksource: 'acpi_pm' wd_now: 8e147 wd_last: 531b43 mask: ffffff > [ 32.908834] clocksource: 'tsc' cs_now: 385f4b6d1e cs_last: 354328bcea mask: ffffffffffffffff > [ 32.922293] clocksource: Switched to clocksource acpi_pm What's the tsc freqeuency on your machine?