Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755554AbYJBW4k (ORCPT ); Thu, 2 Oct 2008 18:56:40 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753235AbYJBW4b (ORCPT ); Thu, 2 Oct 2008 18:56:31 -0400 Received: from lirone.symas.net ([64.71.152.235]:54693 "EHLO lirone.symas.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753300AbYJBW4a (ORCPT ); Thu, 2 Oct 2008 18:56:30 -0400 Message-ID: <48E55196.8060000@symas.com> Date: Thu, 02 Oct 2008 15:56:22 -0700 From: Howard Chu User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; rv:1.9.1b1pre) Gecko/20080917130338 SeaMonkey/2.0a1pre MIME-Version: 1.0 To: Thomas Gleixner CC: linux-kernel Subject: Re: APIC frequency too slow on HP dv5z References: <48E28443.7060708@symas.com> <48E48EE9.9090900@symas.com> In-Reply-To: Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1870 Lines: 44 Thomas Gleixner wrote: > On Thu, 2 Oct 2008, Howard Chu wrote: >> Thomas Gleixner wrote: >>> On Tue, 30 Sep 2008, Howard Chu wrote: >>> >>>> More often than not, on a warm boot I see something like this >>>> >>>> msg.new:[ 1.940031] Using local APIC timer interrupts. >>>> msg.new:[ 1.944031] APIC timer calibration result 466046 >>>> msg.new:[ 1.944031] Detected 0.466 MHz APIC timer. >>>> msg.new:[ 1.944031] APIC frequency too slow, disabling apic timer >>>> >>>> On cold boots it may see 12.5MHz, or may not... >>>> >>>> [ 2.000584] Using local APIC timer interrupts. >>>> [ 2.004067] APIC timer calibration result 12500236 >>>> [ 2.004080] Detected 12.500 MHz APIC timer. >>>> >>>> I haven't figured out yet what the pattern is behind the behavior. Has >>>> anyone >>>> else seen this kind of problem before? >>> Hmm, strange. Which kernel version ? >> I only started paying attention recently. 2.6.27-rc4 thru rc7 for sure. I'm >> running rc7 right now, that's what those log snippets are from. > > Ok. Can you please add apic=verbose to the kernel command line so we > get more detailed info about that ? OK. Of course since you asked for it, the problem refused to show up. It took about a dozen reboots before it appeared again. And then it took 3-4 reboots to make it go away. Full dmesg output is here: http://www.highlandsun.com/hyc/msg.rc7.bad.gz http://www.highlandsun.com/hyc/msg.rc7.ok.gz -- -- Howard Chu CTO, Symas Corp. http://www.symas.com Director, Highland Sun http://highlandsun.com/hyc/ Chief Architect, OpenLDAP http://www.openldap.org/project/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/