From owner-cvs-all Tue Jan 14 15: 0:59 2003 Delivered-To: cvs-all@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 197BB37B401; Tue, 14 Jan 2003 15:00:58 -0800 (PST) Received: from canning.wemm.org (canning.wemm.org [192.203.228.65]) by mx1.FreeBSD.org (Postfix) with ESMTP id A4F9D43F43; Tue, 14 Jan 2003 15:00:57 -0800 (PST) (envelope-from peter@wemm.org) Received: from wemm.org (localhost [127.0.0.1]) by canning.wemm.org (Postfix) with ESMTP id 81B422A89E; Tue, 14 Jan 2003 15:00:57 -0800 (PST) (envelope-from peter@wemm.org) X-Mailer: exmh version 2.5 07/13/2001 with nmh-1.0.4 To: Andrew Gallatin Cc: John Baldwin , Wilko Bulte , cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org, Nate Lawson Subject: Re: cvs commit: src/sys/dev/acpica acpi_cpu.c In-Reply-To: <20030114173224.A74488@grasshopper.cs.duke.edu> Date: Tue, 14 Jan 2003 15:00:57 -0800 From: Peter Wemm Message-Id: <20030114230057.81B422A89E@canning.wemm.org> Sender: owner-cvs-all@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Andrew Gallatin wrote: > John Baldwin [jhb@FreeBSD.org] wrote: > > aggressive policies in the future. You could change the speed on > > your desktop by changing the performance speed to be 6 (75%) using > > the sysctl for example: > > The scary thing is that for my destop setup, I can turn my speed down > to 25% on my P4 and not really feel a difference in xterms, editors > and soforth. (I CAN see a difference, I just don't mind it much). > > Any idea about how much power this actually saves on a desktop? FWIW, we see a (measured) difference of about 50W on 2.2GHz P4's simply by turning machdep.cpu_idle_hlt on and off. I expect the clock throttling would make similar differences. For 1U rack-mount systems (especially in California) this is a Big Deal. Cheers, -Peter -- Peter Wemm - peter@wemm.org; peter@FreeBSD.org; peter@yahoo-inc.com "All of this is for nothing if we don't go to the stars" - JMS/B5 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message