From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757505Ab0EZS2f (ORCPT ); Wed, 26 May 2010 14:28:35 -0400 Received: from terminus.zytor.com ([198.137.202.10]:35748 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751936Ab0EZS2e (ORCPT ); Wed, 26 May 2010 14:28:34 -0400 Message-ID: <4BFD675E.6020208@zytor.com> Date: Wed, 26 May 2010 11:24:30 -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: john stultz CC: Brian Bloniarz , Dan Magenheimer , 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> <4BFB2902.50308@athenacr.com> <4BFC687A.9040304@athenacr.com> <1274834888.4678.66.camel@localhost.localdomain> <4BFC8C77.7020802@athenacr.com> <1274886299.1759.8.camel@work-vm> <4BFD4629.6040602@athenacr.com> <1274891109.1759.27.camel@work-vm> In-Reply-To: <1274891109.1759.27.camel@work-vm> 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 05/26/2010 09:25 AM, john stultz wrote: > > Brian: is this something the NTPd folks actually want? Has anyone > checked with them before we hand down the solution from high upon on > lkml mountain? > > Personally I think NTPd should be a little more savvy about how far it > trusts the drift file when it starts up. Since I believe its > fast-startup mode can quickly estimate the drift well within 100ppm, > which is about the maximum variance I've seen from the calibration code. > Engaging with them is probably a good idea. In the past, the NTP core folks have been extremely anti-Linux and pro-BSD and therefore unwilling to talk, but that has at least in part been due to what they perceive as unilateral actions on our part. -hpa