From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Tue, 19 Nov 2002 10:39:32 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Tue, 19 Nov 2002 10:39:32 -0500 Received: from ns.suse.de ([213.95.15.193]:14865 "EHLO Cantor.suse.de") by vger.kernel.org with ESMTP id ; Tue, 19 Nov 2002 10:39:31 -0500 Date: Tue, 19 Nov 2002 16:46:34 +0100 From: Andi Kleen To: Alan Cox , Andi Kleen Cc: Paul Larson , Linux Kernel Mailing List Subject: Re: [LTP] Re: LTP - gettimeofday02 FAIL Message-ID: <20021119154634.GA29949@wotan.suse.de> References: <200211190127.gAJ1RWg11023@linux.local.suse.lists.linux.kernel> <1037713044.24031.15.camel@plars.suse.lists.linux.kernel> <1037719651.12118.7.camel@irongate.swansea.linux.org.uk> <20021119151028.GA13979@wotan.suse.de> <1037722343.12086.16.camel@irongate.swansea.linux.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1037722343.12086.16.camel@irongate.swansea.linux.org.uk> User-Agent: Mutt/1.4i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Nov 19, 2002 at 04:12:23PM +0000, Alan Cox wrote: > On Tue, 2002-11-19 at 15:10, Andi Kleen wrote: > > It is because of the HZ=1000. See Jim Houston's mail on the same topic, > > he analyzed the failure. > > > > Basically the current code cannot handle missing ticks properly on SMP and with > > the new 1ms tick it is much more likely that a timer interrupt gets lost. > > Ok so add that to the other existing 2.5 timer handling bugs 8( 2.4 has the same problem, it is just much less likely to hit because of HZ=100 -Andi