Date: Tue, 14 Jan 2003 15:00:57 -0800 From: Peter Wemm <peter@wemm.org> To: Andrew Gallatin <gallatin@cs.duke.edu> Cc: John Baldwin <jhb@FreeBSD.org>, Wilko Bulte <wkb@freebie.xs4all.nl>, cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org, Nate Lawson <njl@FreeBSD.org> Subject: Re: cvs commit: src/sys/dev/acpica acpi_cpu.c Message-ID: <20030114230057.81B422A89E@canning.wemm.org> In-Reply-To: <20030114173224.A74488@grasshopper.cs.duke.edu>
next in thread | previous in thread | raw e-mail | index | archive | help
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
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20030114230057.81B422A89E>