From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753490Ab1KGTgl (ORCPT ); Mon, 7 Nov 2011 14:36:41 -0500 Received: from e23smtp06.au.ibm.com ([202.81.31.148]:35526 "EHLO e23smtp06.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753194Ab1KGTgk (ORCPT ); Mon, 7 Nov 2011 14:36:40 -0500 Message-ID: <4EB83341.9080600@linux.vnet.ibm.com> Date: Tue, 08 Nov 2011 01:06:33 +0530 From: "Srivatsa S. Bhat" User-Agent: Mozilla/5.0 (X11; Linux i686; rv:7.0) Gecko/20110927 Thunderbird/7.0 MIME-Version: 1.0 To: Suresh Siddha CC: Thomas Gleixner , H Peter Anvin , Ingo Molnar , john stultz , linux-kernel Subject: Re: [patch] x86, tsc: skip TSC synchronization checks for tsc=reliable References: <1320446537.15071.14.camel@sbsiddha-desk.sc.intel.com> In-Reply-To: <1320446537.15071.14.camel@sbsiddha-desk.sc.intel.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, On 11/05/2011 04:12 AM, Suresh Siddha wrote: > tsc=reliable boot parameter is supposed to skip all the TSC stablility > checks during boot time. > > On a 8-socket system where we want to run an experiment with the > "tsc=reliable" boot option, TSC synchronization checks are not > getting skipped and marking the TSC as not stable. > I was facing this same problem some time back with some of my machines. > Check for tsc_clocksource_reliable (which is set via tsc=reliable or > for platforms supporting synthetic TSC_RELIABLE feature bit etc) > and when set, skip the TSC synchronization tests during boot. > This patch fixes the issue. Thanks for the fix! > Signed-off-by: Suresh Siddha Tested-by: Srivatsa S. Bhat Thanks, Srivatsa S. Bhat