From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1422729AbXBURkz (ORCPT ); Wed, 21 Feb 2007 12:40:55 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1422731AbXBURky (ORCPT ); Wed, 21 Feb 2007 12:40:54 -0500 Received: from gateway-1237.mvista.com ([63.81.120.158]:7326 "EHLO gateway-1237.mvista.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1422729AbXBURky (ORCPT ); Wed, 21 Feb 2007 12:40:54 -0500 Subject: Re: Linux 2.6.21-rc1 From: Daniel Walker To: tglx@linutronix.de Cc: Linus Torvalds , Linux Kernel Mailing List , mingo@elte.hu In-Reply-To: <1172079671.25076.80.camel@localhost.localdomain> References: <1172075053.8577.38.camel@imap.mvista.com> <1172077664.25076.75.camel@localhost.localdomain> <1172078340.8577.43.camel@imap.mvista.com> <1172079671.25076.80.camel@localhost.localdomain> Content-Type: text/plain Date: Wed, 21 Feb 2007 09:38:43 -0800 Message-Id: <1172079523.8577.48.camel@imap.mvista.com> Mime-Version: 1.0 X-Mailer: Evolution 2.8.2.1 (2.8.2.1-3.fc6) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2007-02-21 at 18:41 +0100, Thomas Gleixner wrote: > On Wed, 2007-02-21 at 09:19 -0800, Daniel Walker wrote: > > > At this point the PIT / HPET _is_ active and incrementing jiffies. The > > > switch to local apic timers happens afterwards. > > > > Could be the switch over then which confuses the NMI . > > Why? The switch just stops the PIT/HPET. It does not fiddle with IO_APIC > and friends at all. I'm not an expert on the io-apic, but the check_timer() function seemed to assume IRQ0 was happening regularly .. > > ftp://source.mvista.com/pub/dwalker/tglx/ > > Nothing obvious. Bisect time :( Well, I'm pretty sure it's HRT, cause in prior versions this only happened when HRT is enabled. Then you guys went to the lapic all the time, and now this is happening all the time .. You can't reproduce this? Daniel