Date: Wed, 10 Jan 2007 10:49:40 -0800 From: George Hartzell <hartzell@alerce.com> To: Peter Jeremy <peterjeremy@optushome.com.au> Cc: freebsd-stable@freebsd.org Subject: Re: saving power in a Dell Poweredge 750. Message-ID: <17829.13636.926529.357546@rosebud.alerce.com> In-Reply-To: <20070110183643.GI832@turion.vk2pj.dyndns.org> References: <17829.9117.888327.881204@rosebud.alerce.com> <20070110183643.GI832@turion.vk2pj.dyndns.org>
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Peter Jeremy writes: > On Wed, 2007-Jan-10 09:34:21 -0800, George Hartzell wrote: > >I hooked my kill-a-watt meter up and ran the machine for a couple of > >days and it uses 88 watts (3.90KWH/44.01H). > > What was it doing for those couple of days? [...] It's a small time mail server and web host. It was running under its real world load. > I presume you confirmed that cpufreq/powerd was actually functioning > (ie the CPU frequency was being changed). Yep, or at least I confirmed that powerd -v from a shell cycled up and down w/ demand, then I configured it to run as a daemon and confirmed that was cpufreq was loaded and that powerd was running in the background. > >That surprised me a bit, and seems to suggest that it's spending most > >of its energy spinning fans or something. > > PSU overheads, fans, northbridge, video, RAM, disk, ... it all adds up. That's sort of what I was figuring, it is/was just that my laptop experience with powerd and battery life suggested that there would be more of a difference. > I can't specifically help with the Dell. Thanks for the thoughts! g.
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