Problem on AMD64
smithi at nimnet.asn.au
Mon Dec 22 19:40:53 PST 2008
On Mon, 22 Dec 2008, Dmitry Kolosov wrote:
> Could you give to us some links about powersaving with EST? For now, i'm using
> powerd_flags="-a maximum -b adaptive -n adaptive -r 30 -i 35"
> in my rc.conf. I'm not on AMD64, so i'm sorry, powerd works well to me (125 MHz
> on battery and 2.16GHz on AC), BUT battery life time is equal in both cases and
> something about 50 minutes, so i think powerd is not so powerfull for me.
-i percent Specifies the CPU idle percent level when adaptive mode
should begin to degrade performance to save power. The
default is 90% or higher.
-r percent Specifies the CPU idle percent level where adaptive mode
should consider the CPU running and increase performance.
The default is 65% or lower.
I don't think your powerd running and idle percentages are likely to
work too well; too close together, and too close to the 'busy' end.
Try stopping powerd (/etc/rc.d/powerd stop) then running powerd manually
in verbose mode in its own console (powerd -v [flags]) to watch how it
behaves under varying loads.
I suspect that you will find it 'flapping' between some frequencies too
often at constant load, as there's insufficient hysteresis between the
idle/running marks. Compare it with using the default -i and -r and if
those aren't suitable, try rather smaller variations from the defaults.
If it lacks responsiveness, try decreasing the polling interval.
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