From owner-freebsd-arch@FreeBSD.ORG Tue Mar 18 09:00:08 2008 Return-Path: Delivered-To: arch@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 022B81065678 for ; Tue, 18 Mar 2008 09:00:08 +0000 (UTC) (envelope-from bzeeb-lists@lists.zabbadoz.net) Received: from mail.cksoft.de (mail.cksoft.de [62.111.66.27]) by mx1.freebsd.org (Postfix) with ESMTP id AFA9A8FC1C for ; Tue, 18 Mar 2008 09:00:07 +0000 (UTC) (envelope-from bzeeb-lists@lists.zabbadoz.net) Received: from localhost (amavis.str.cksoft.de [192.168.74.71]) by mail.cksoft.de (Postfix) with ESMTP id 18AC441C799; Tue, 18 Mar 2008 10:00:06 +0100 (CET) X-Virus-Scanned: amavisd-new at cksoft.de Received: from mail.cksoft.de ([62.111.66.27]) by localhost (amavis.str.cksoft.de [192.168.74.71]) (amavisd-new, port 10024) with ESMTP id 5m2ofGw5OFIx; Tue, 18 Mar 2008 10:00:05 +0100 (CET) Received: by mail.cksoft.de (Postfix, from userid 66) id 9A90241C798; Tue, 18 Mar 2008 10:00:05 +0100 (CET) Received: from maildrop.int.zabbadoz.net (maildrop.int.zabbadoz.net [10.111.66.10]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.int.zabbadoz.net (Postfix) with ESMTP id CB45044487F; Tue, 18 Mar 2008 08:59:42 +0000 (UTC) Date: Tue, 18 Mar 2008 08:59:42 +0000 (UTC) From: "Bjoern A. Zeeb" X-X-Sender: bz@maildrop.int.zabbadoz.net To: Poul-Henning Kamp In-Reply-To: <3860.1205764623@critter.freebsd.dk> Message-ID: <20080318085804.I50685@maildrop.int.zabbadoz.net> References: <3860.1205764623@critter.freebsd.dk> X-OpenPGP-Key: 0x14003F198FEFA3E77207EE8D2B58B8F83CCF1842 MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Cc: arch@freebsd.org Subject: Re: Power-Mgt (Was: Re: cvs commit: src/sys/i386/cpufreq est.c ) X-BeenThere: freebsd-arch@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussion related to FreeBSD architecture List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 18 Mar 2008 09:00:08 -0000 On Mon, 17 Mar 2008, Poul-Henning Kamp wrote: Hi, > [Moved to arch@] > > In general, I think we must make power-aware computing our "next > SMPng project", not in the sense of delaying the next major release > five years, but in the sense that power consumption should permerate > our thinking about the operating system from now on. > > Overall, I think that means that we should: > > * Enable performance neutral power savings on servers > - spin down unused disks. (geom/drivers) > - use only as many CPU cores as necessary (scheduler) > - light cpu-throttling. > - downgrading 1GB to 100MB ether when idle. > > * Aim to meet or execeed energystar 4.0/5.0[1] on desktops and > plugged laptops. > - Pretty much as above, but with specific targets. > - http://www.energystar.gov/index.cfm?c=revisions.computer_spec > > * Be as battery-frugal as possible on battery driven laptops. > - Any trick in and off the book. so while this topic is one, what actually happens to an unrecognized card or a card with no driver loaded currently? How much power does an unsued card use and can we do anything about that? Are we perhaps already doing something about that? /bz -- Bjoern A. Zeeb bzeeb at Zabbadoz dot NeT Software is harder than hardware so better get it right the first time.