From owner-freebsd-bugs@FreeBSD.ORG  Sat Mar 15 16:20:04 2008
Return-Path: <owner-freebsd-bugs@FreeBSD.ORG>
Delivered-To: freebsd-bugs@hub.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 54030106564A
	for <freebsd-bugs@hub.freebsd.org>;
	Sat, 15 Mar 2008 16:20:04 +0000 (UTC)
	(envelope-from gnats@FreeBSD.org)
Received: from freefall.freebsd.org (freefall.freebsd.org
	[IPv6:2001:4f8:fff6::28])
	by mx1.freebsd.org (Postfix) with ESMTP id 50A548FC12
	for <freebsd-bugs@hub.freebsd.org>;
	Sat, 15 Mar 2008 16:20:04 +0000 (UTC)
	(envelope-from gnats@FreeBSD.org)
Received: from freefall.freebsd.org (gnats@localhost [127.0.0.1])
	by freefall.freebsd.org (8.14.2/8.14.2) with ESMTP id m2FGK3P6050429
	for <freebsd-bugs@freefall.freebsd.org>; Sat, 15 Mar 2008 16:20:03 GMT
	(envelope-from gnats@freefall.freebsd.org)
Received: (from gnats@localhost)
	by freefall.freebsd.org (8.14.2/8.14.1/Submit) id m2FGK31S050427;
	Sat, 15 Mar 2008 16:20:03 GMT (envelope-from gnats)
Date: Sat, 15 Mar 2008 16:20:03 GMT
Message-Id: <200803151620.m2FGK31S050427@freefall.freebsd.org>
To: freebsd-bugs@FreeBSD.org
From: Nate Eldredge <neldredge@math.ucsd.edu>
Cc: 
Subject: Re: bin/120490: powerd should let me specify desired frequencies
X-BeenThere: freebsd-bugs@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
Reply-To: Nate Eldredge <neldredge@math.ucsd.edu>
List-Id: Bug reports <freebsd-bugs.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-bugs>,
	<mailto:freebsd-bugs-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-bugs>
List-Post: <mailto:freebsd-bugs@freebsd.org>
List-Help: <mailto:freebsd-bugs-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-bugs>,
	<mailto:freebsd-bugs-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 15 Mar 2008 16:20:04 -0000

The following reply was made to PR bin/120490; it has been noted by GNATS.

From: Nate Eldredge <neldredge@math.ucsd.edu>
To: Kris Kennaway <kris@FreeBSD.org>
Cc: Nate Eldredge <neldredge@ucsd.edu>, freebsd-gnats-submit@FreeBSD.org
Subject: Re: bin/120490: powerd should let me specify desired frequencies
Date: Sat, 15 Mar 2008 08:52:55 -0700 (PDT)

 On Sun, 17 Feb 2008, Kris Kennaway wrote:
 
 > Nate Eldredge wrote:
 >
 >> powerd(8) in adaptive mode adjusts the CPU frequency based on the list from 
 >> dev.cpu.0.freq_levels, it gradually moves through all available 
 >> frequencies.  However, in my case this is not desirable; only two of the 
 >> available frequencies are actually useful.  The CPU's full speed is 1800 
 >> MHz; powernow also has a 1000 MHz setting that saves about 20W.  But there 
 >> are a bunch of other frequencies that apparently come from ACPI.  They do 
 >> slow down the CPU, but based on my tests the machine's power consumption 
 >> does not actually change, so there is not much point in using them. 
 >> Furthermore, the ACPI frequencies include some really low ones (250MHz or 
 >> so) which crash the machine if selected.  So I really just want powerd to 
 >> switch between 1800 and 1000.
 >> 
 >> It would be useful for powerd to have an option to manually specify a list 
 >> of desired frequencies.
 >
 > Just disable the services that are providing the alternate frequencies. 
 > Probably acpi_throttle.
 
 Just to follow up: that worked.  I put hint.acpi_throttle.0.disabled="1" 
 in /boot/device.hints.  Thanks!
 
 -- 
 
 Nate Eldredge
 neldredge@math.ucsd.edu