From owner-freebsd-current@FreeBSD.ORG  Sun Nov 16 19:06:36 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 CE02A16A4CE
	for <current@freebsd.org>; Sun, 16 Nov 2003 19:06:36 -0800 (PST)
Received: from rootlabs.com (root.org [67.118.192.226])
	by mx1.FreeBSD.org (Postfix) with SMTP id 32A8743FBF
	for <current@freebsd.org>; Sun, 16 Nov 2003 19:06:36 -0800 (PST)
	(envelope-from nate@rootlabs.com)
Received: (qmail 58545 invoked by uid 1000); 17 Nov 2003 03:06:38 -0000
Date: Sun, 16 Nov 2003 19:06:38 -0800 (PST)
From: Nate Lawson <nate@root.org>
To: Lukas Ertl <l.ertl@univie.ac.at>
In-Reply-To: <20031116214644.T624@korben.in.tern>
Message-ID: <20031116190312.M58542@root.org>
References: <20031115121418.U54473@root.org>
	<20031116214644.T624@korben.in.tern>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
cc: acpi-jp@jp.freebsd.org
cc: current@freebsd.org
Subject: Re: cvs commit: src/sys/dev/acpica acpi_cpu.c src/share/man/man4  
 acpi.4 src/sys/conf files src/sys/modules/acpi Makefile
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: Mon, 17 Nov 2003 03:06:36 -0000

On Sun, 16 Nov 2003, Lukas Ertl wrote:
> On Sat, 15 Nov 2003, Nate Lawson wrote:
>
> > Please test this to be sure that it boots ok on your machine, especially
> > SMP boxes.  Throttling should still work ok also.
>
> Seems to work here:
>
> hw.acpi.cpu.cx_supported: C1/1 C2/1 C3/85 C3/185
> hw.acpi.cpu.cx_lowest: 0
> hw.acpi.cpu.cx_history: 173839/0 0/0 0/0 0/0
>
> I've no idea if it actually has an effect.

Yes, it is working fine for you.  Those states look like a Centrino.
(I've gotten familiar with how different chipsets look).  In any case, the
default is to just use C1 which is the same as previous behavior.  To get
better power savings, set cx_lowest to 1, 2, or 3.  The counters in the
appropriate slots will go up in cx_history.  From your latencies, you
should be fine with a value of 1 and see a slight performance loss for 2
or 3 (but very small).  I'd be interested in any testing results you find
for each of those values (in terms of power and performance).

-Nate