Date: Thu, 11 Jan 2007 10:12:11 +0100 (CET) From: Oliver Fromme <olli@lurza.secnetix.de> To: freebsd-stable@FreeBSD.ORG, hartzell@alerce.com Subject: Re: saving power in a Dell Poweredge 750. Message-ID: <200701110912.l0B9CBm5068986@lurza.secnetix.de> In-Reply-To: <17829.9117.888327.881204@rosebud.alerce.com>
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George Hartzell wrote: > I'm setting up a Dell Poweredge 750 1U server. A friend is loaning me > space in his rack and since his rack usage is limited by power I'd > like to be as thrifty as possible. > > 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). > > Then I kldloaded cpufreq and enabled powerd and it still uses 88 watts > (8.35KWH/93.47H). Did you verify that powerd actually reduced the CPU frequency? What's the output from "sysctl dev.cpu.0"? It might be enlightening to watch the following shell loop for a while: while :; do sysctl dev.cpu.0.freq; sleep 1; done By the way, do you have an SMP system, or are you running a kernel without SMP? "sysctl machdep.cpu_idle_hlt"? Best regards Oliver -- Oliver Fromme, secnetix GmbH & Co. KG, Marktplatz 29, 85567 Grafing Dienstleistungen mit Schwerpunkt FreeBSD: http://www.secnetix.de/bsd Any opinions expressed in this message may be personal to the author and may not necessarily reflect the opinions of secnetix in any way. "Perl will consistently give you what you want, unless what you want is consistency." -- Larry Wall
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