Date: Tue, 18 Mar 2008 08:59:42 +0000 (UTC) From: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: arch@freebsd.org Subject: Re: Power-Mgt (Was: Re: cvs commit: src/sys/i386/cpufreq est.c ) Message-ID: <20080318085804.I50685@maildrop.int.zabbadoz.net> In-Reply-To: <3860.1205764623@critter.freebsd.dk> References: <3860.1205764623@critter.freebsd.dk>
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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.
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