From owner-freebsd-stable@FreeBSD.ORG  Fri Dec  2 14:04:47 2005
Return-Path: <owner-freebsd-stable@FreeBSD.ORG>
X-Original-To: freebsd-stable@freebsd.org
Delivered-To: freebsd-stable@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 7050E16A41F
	for <freebsd-stable@freebsd.org>; Fri,  2 Dec 2005 14:04:47 +0000 (GMT)
	(envelope-from marco.calviani@gmail.com)
Received: from wproxy.gmail.com (wproxy.gmail.com [64.233.184.201])
	by mx1.FreeBSD.org (Postfix) with ESMTP id DBBBA43D49
	for <freebsd-stable@freebsd.org>; Fri,  2 Dec 2005 14:04:46 +0000 (GMT)
	(envelope-from marco.calviani@gmail.com)
Received: by wproxy.gmail.com with SMTP id i2so22334wra
	for <freebsd-stable@freebsd.org>; Fri, 02 Dec 2005 06:04:46 -0800 (PST)
DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com;
	h=received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references;
	b=om6D6I/ZOfrjIClwFyB4NPAJXUGw3poGP755VmRrLvCdutd7yFr2Ey2JwiZj1WIVxnTvP8NgBbQk50VyuU1JTuXu6TmVmipysM5yWvcgd+b0voPzGyJPbiIJEjYWTkZ1tlEn/76N9/Ck33+zjIN+JAcBJyc7mXEO8/SWHVQmjl4=
Received: by 10.65.123.16 with SMTP id a16mr1479054qbn;
	Fri, 02 Dec 2005 06:04:45 -0800 (PST)
Received: by 10.65.243.16 with HTTP; Fri, 2 Dec 2005 06:04:45 -0800 (PST)
Message-ID: <da5cd1900512020604p22e6a18fu@mail.gmail.com>
Date: Fri, 2 Dec 2005 15:04:45 +0100
From: Marco Calviani <marco.calviani@gmail.com>
To: freebsd-acpi@freebsd.org, freebsd-stable@freebsd.org, 
	freebsd-questions@freebsd.org
In-Reply-To: <20051202134913.GD24254@poupinou.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline
References: <da5cd1900511300337t22728ec8y@mail.gmail.com>
	<20051201141724.GE17066@poupinou.org>
	<da5cd1900512020105t60c1191cw@mail.gmail.com>
	<200512022035.55854.doconnor@gsoft.com.au>
	<20051202134913.GD24254@poupinou.org>
Cc: 
Subject: Re: cpufreq and changing driver
X-BeenThere: freebsd-stable@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Production branch of FreeBSD source code <freebsd-stable.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>, 
	<mailto:freebsd-stable-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-stable>
List-Post: <mailto:freebsd-stable@freebsd.org>
List-Help: <mailto:freebsd-stable-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>,
	<mailto:freebsd-stable-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 02 Dec 2005 14:04:47 -0000

Hi list,

2005/12/2, Bruno Ducrot <ducrot@poupinou.org>:


> > I don't see why you can't run powerd more frequently, I do.. Unless you=
r ACPI
> > has a problem that means the transition is slow.
>
> I'm sure this could not be done under Linux without a lot of
> problems (it is required to use the /proc things and it's too slow in
> that case).
>
> > I can't imagine that doing 5 (or even 50) syscalls a second is a big CP=
U load
> > unless there is a specific problem with sysctls or the cpufreq
> > infrastructure.
>
> If that's possible being not so intrusive with, say 50 syscalls under Fre=
eBSD,
> then all I said above is indeed stupid crap.
>
> > I run powerd like this ->
> > /usr/sbin/powerd -i 90 -r 30 -a adaptive -b adaptive -n adaptive -p 200
> >

Well, i've tried decreasing the polling interval, but there is an
increased powerd cpu load: at 100ms polling interval the cpu load is
to an astonishing 20% circa, which i think it's too much for a normal
use. The sampling rate with ondemand governor in linux kernel is 10ms
but cpufreqd is at 0.6% on average cpu load.

Regards,
MC