From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932353Ab0EYALI (ORCPT ); Mon, 24 May 2010 20:11:08 -0400 Received: from terminus.zytor.com ([198.137.202.10]:35450 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755185Ab0EYALG (ORCPT ); Mon, 24 May 2010 20:11:06 -0400 Message-ID: <4BFB14BE.8070407@zytor.com> Date: Mon, 24 May 2010 17:07:26 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.9) Gecko/20100430 Fedora/3.0.4-2.fc12 Thunderbird/3.0.4 MIME-Version: 1.0 To: Dan Magenheimer CC: john stultz , Brian Bloniarz , Ingo Molnar , Thomas Gleixner , Peter Zijlstra , Andi Kleen , Arjan van de Ven , Venkatesh Pallipadi , chris.mason@oracle.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH] x86: Export tsc related information in sysfs References: <4BF58B59.7080901@athenacr.com> <1274727116.2954.5.camel@localhost.localdomain> <4BFADF9D.9050209@zytor.com> <1274733566.2954.73.camel@localhost.localdomain> <3ec7f284-1507-47fb-b5a2-eea29f68c627@default> <4BFAFE17.8060105@zytor.com> <1274741362.2954.80.camel@localhost.localdomain> In-Reply-To: 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 On 05/24/2010 05:01 PM, Dan Magenheimer wrote: > On a quick sample of two machines looking at the TSC calibration > done by Xen (which exposes the equivalent of tsc_khz), it appears > that the stamped value is different from the calibration by about > 1000ppm. YMMV. So pretty seriously different. Less than I would have expected, but not out of the ballpark. -hpa