From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750748AbWGWIRD (ORCPT ); Sun, 23 Jul 2006 04:17:03 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750755AbWGWIRD (ORCPT ); Sun, 23 Jul 2006 04:17:03 -0400 Received: from run.smurf.noris.de ([192.109.102.41]:26861 "EHLO smurf.noris.de") by vger.kernel.org with ESMTP id S1750748AbWGWIRB (ORCPT ); Sun, 23 Jul 2006 04:17:01 -0400 Date: Sun, 23 Jul 2006 10:16:04 +0200 To: Andrew Morton Cc: linux-kernel@vger.kernel.org, johnstul@us.ibm.com, torvalds@osdl.org, bunk@stusta.de, lethal@linux-sh.org, hirofumi@mail.parknet.co.jp Subject: Re: REGRESSION: the new i386 timer code fails to sync CPUs Message-ID: <20060723081604.GD27566@kiste.smurf.noris.de> References: <20060722233638.GC27566@kiste.smurf.noris.de> <20060722173649.952f909f.akpm@osdl.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20060722173649.952f909f.akpm@osdl.org> User-Agent: Mutt/1.5.11 From: Matthias Urlichs X-Smurf-Spam-Score: -2.6 (--) X-Smurf-Whitelist: +relay_from_hosts Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi, Azndrew Morton: > What is 2.6.17-test-1.29? My test build; standard kernel during bisection. > How do you know that 5d0cf410e94b1f1ff852c3f210d22cc6c5a27ffa caused this? > git bisect. > Are you able to test the below? It should fix up the reporting. > Applied. > Are you able to compare the present bootlog with the 2.6.17 bootlog? > Sure. The diff says: checking TSC synchronization across 4 CPUs: +CPU#0 had 748437 usecs TSC skew, fixed it up. +CPU#1 had 748437 usecs TSC skew, fixed it up. +CPU#2 had -748437 usecs TSC skew, fixed it up. +CPU#3 had -748437 usecs TSC skew, fixed it up. Brought up 4 CPUs -migration_cost=4000,8000 +migration_cost=85,1724 ... but apparently, that skew is not corrected. These numbers do match the difference in observed "date" outputs. -- Matthias Urlichs | {M:U} IT Design @ m-u-it.de | smurf@smurf.noris.de Disclaimer: The quote was selected randomly. Really. | http://smurf.noris.de - - The first place you look for something is the last place you'd expect to find it.