From owner-freebsd-current@FreeBSD.ORG  Wed Dec 10 10:04:53 2003
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id F0B9A16A4CE
	for <current@freebsd.org>; Wed, 10 Dec 2003 10:04:53 -0800 (PST)
Received: from rootlabs.com (root.org [67.118.192.226])
	by mx1.FreeBSD.org (Postfix) with SMTP id 6393D43D29
	for <current@freebsd.org>; Wed, 10 Dec 2003 10:04:51 -0800 (PST)
	(envelope-from nate@rootlabs.com)
Received: (qmail 46604 invoked by uid 1000); 10 Dec 2003 18:04:51 -0000
Date: Wed, 10 Dec 2003 10:04:51 -0800 (PST)
From: Nate Lawson <nate@root.org>
To: John Baldwin <jhb@FreeBSD.org>
In-Reply-To: <XFMail.20031210114404.jhb@FreeBSD.org>
Message-ID: <20031210100342.B46577@root.org>
References: <XFMail.20031210114404.jhb@FreeBSD.org>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
cc: acpi-jp@jp.freebsd.org
cc: current@freebsd.org
Subject: RE: ACPI throttling changes
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 10 Dec 2003 18:04:54 -0000

On Wed, 10 Dec 2003, John Baldwin wrote:
> On 10-Dec-2003 Nate Lawson wrote:
> > I'm working on a shared CPU frequency control driver.  One step is to
> > remove some of the autonomy of the throttling portion of acpi_cpu.
> > Please test this patch if you have a machine which supports throttling.
> > With this patch, throttling can be changed by doing:
> >
> >    sysctl hw.acpi.cpu.current_speed=X
> >
> > where X is some number between 1 and hw.acpi.cpu.max_speed.  It is no
> > longer driven by AC line transitions.  Run a CPU benchmark like this one
> > to make sure the throttling transition still works with this patch.
> >
> >     dd if=/dev/zero bs=1m count=500 | md5
> >
> > This is part of a larger work.  Don't worry, it won't be committed until
> > general CPU frequency control is done so no loss of functionality will be
> > committed.
>
> We need to support using throttling for passive cooling btw.  My new laptop
> I just got has no active cooling support, but does have _TC1 and _TC2 objects
> in its thermal zone.  Are you going to add that?

Eventually.  The first step is to get a general frequency control driver
working.  It will also do throttling as well as speedstep, longrun, etc.
The step after that is to change acpi_thermal to use that driver for
passive cooling.

-Nate