Daniel O'Connor wrote:
On Thu, 12 Jan 2006 10:57, Mike Jakubik wrote:
It seems that powerd does very little in terms of reducing heat, and
sacrifices performance while doing so. Am i wrong to assume that
lowering the cpu's frequency should reduce consumed power, and therefore
reduce the amount of heat produced? I have tested with mbmon and i see
no difference between an idle system running with powerd at 75mhz, and
at full rate without. Also, while testing the speed of a php script, i
If you want to test how much heat your system draws for a given clock speed
you should dispense with powerd and just set the frequency by hand, ie..
sysctl dev.cpu.0.freq=XXX
powerd won't run your CPU at a specific clock frequency - it varies the CPU
frequency based on current load conditions.
The load was 0, only thing that was running was mbmon.
Do you have thermally controlled fans? If so I wouldn't expect the temperature
to vary with clock speed very much at all.
No, i do not.
The powerd defaults do not change frequency that quickly - every 500ms by
default. I run it with '-p 200' and it seems fine although you do notice it
'stick' sometimes (where the CPU change doesn't happen quickly enough).
You could try what I do but there are some systems which are very slow to
change clock speed so this could be an impediment.
What was part of my question, is it the hardware or the software thats
at fault here. I.e. would a cool n quiet system be better.
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