From owner-freebsd-acpi@FreeBSD.ORG  Wed Jul 21 18:36:54 2004
Return-Path: <owner-freebsd-acpi@FreeBSD.ORG>
Delivered-To: freebsd-acpi@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 5EE4D16A4CE
	for <freebsd-acpi@freebsd.org>; Wed, 21 Jul 2004 18:36:54 +0000 (GMT)
Received: from www.cryptography.com (li-22.members.linode.com [64.5.53.22])
	by mx1.FreeBSD.org (Postfix) with ESMTP id DBB5443D41
	for <freebsd-acpi@freebsd.org>; Wed, 21 Jul 2004 18:36:53 +0000 (GMT)
	(envelope-from nate@root.org)
Received: from [10.0.0.34] (adsl-63-195-111-154.dsl.snfc21.pacbell.net
	[63.195.111.154])
	by www.cryptography.com (8.12.8/8.12.8) with ESMTP id i6LIaqrb021002
	(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT);
	Wed, 21 Jul 2004 11:36:52 -0700
Message-ID: <40FEB73E.7020102@root.org>
Date: Wed, 21 Jul 2004 11:34:38 -0700
From: Nate Lawson <nate@root.org>
User-Agent: Mozilla Thunderbird 0.7.1 (Windows/20040626)
X-Accept-Language: en-us, en
MIME-Version: 1.0
To: Ted Faber <faber@ISI.EDU>
References: <20040720165016.GA35412@pun.isi.edu> <40FD6BEB.4060102@root.org>
	<20040721171853.GB45921@pun.isi.edu>
In-Reply-To: <20040721171853.GB45921@pun.isi.edu>
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit
cc: freebsd-acpi@freebsd.org
Subject: 
	Re: Dell Latitude 610 CPU clock rate degrading (debug info included)
X-BeenThere: freebsd-acpi@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: ACPI and power management development <freebsd-acpi.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-acpi>,
	<mailto:freebsd-acpi-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-acpi>
List-Post: <mailto:freebsd-acpi@freebsd.org>
List-Help: <mailto:freebsd-acpi-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-acpi>,
	<mailto:freebsd-acpi-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 21 Jul 2004 18:36:54 -0000

Ted Faber wrote:
> On Tue, Jul 20, 2004 at 12:00:59PM -0700, Nate Lawson wrote:
> 
>>Ted Faber wrote:
>>>I tried booting without ACPI, but my time of day clock ran consistenty
>>>slow - which might mean that the same degredation was occurring without
>>>the OS readjusting for it.  In any case it wasn't clear that no ACPI
>>>helped.
>>
>>Same problem.  What timecounter are you using?  Switching away from TSC 
>>would help this.
> 
> With ACPI there's no clock skew problem, so that's how I've been
> running.  Just for my information, how might I switch timecounters?  (It
> sounds like it won't solve the problem to switch away from ACPI, but I'm
> curious).

When running without ACPI, you should use the i8254 timecounter.  Switch 
it with this command (or put it in /etc/sysctl.conf):

sysctl kern.timecounter.hardware="i8254"

-- 
-Nate