Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754577AbYJBJNr (ORCPT ); Thu, 2 Oct 2008 05:13:47 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753767AbYJBJNh (ORCPT ); Thu, 2 Oct 2008 05:13:37 -0400 Received: from www.tglx.de ([62.245.132.106]:49332 "EHLO www.tglx.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753518AbYJBJNg (ORCPT ); Thu, 2 Oct 2008 05:13:36 -0400 Date: Thu, 2 Oct 2008 11:13:26 +0200 (CEST) From: Thomas Gleixner To: Howard Chu cc: linux-kernel Subject: Re: APIC frequency too slow on HP dv5z In-Reply-To: <48E48EE9.9090900@symas.com> Message-ID: References: <48E28443.7060708@symas.com> <48E48EE9.9090900@symas.com> User-Agent: Alpine 1.10 (LFD 962 2008-03-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1390 Lines: 37 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 ? Thanks, tglx -- 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/