saving power in a Dell Poweredge 750.
hartzell at alerce.com
Thu Jan 11 17:15:14 UTC 2007
Oliver Fromme writes:
> 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
I hadn't actually done *that* (but I had run powerd -v for a while and
watched). Here you go:
while? sysctl dev.cpu.0.freq
while? sleep 5
> By the way, do you have an SMP system, or are you running
> a kernel without SMP? "sysctl machdep.cpu_idle_hlt"?
It's a uniprocessor machine, hyperthreading capable but that's
disabled in the bios.
Thanks for thinking about this!
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