Marco Calviani wrote:
Hi list,
2005/12/2, Bruno Ducrot <[EMAIL PROTECTED]>:
I don't see why you can't run powerd more frequently, I do.. Unless your ACPI
has a problem that means the transition is slow.
I'm sure this could not be done under Linux without a lot of
problems (it is required to use the /proc things and it's too slow in
that case).
I can't imagine that doing 5 (or even 50) syscalls a second is a big CPU load
unless there is a specific problem with sysctls or the cpufreq
infrastructure.
If that's possible being not so intrusive with, say 50 syscalls under FreeBSD,
then all I said above is indeed stupid crap.
I run powerd like this ->
/usr/sbin/powerd -i 90 -r 30 -a adaptive -b adaptive -n adaptive -p 200
Well, i've tried decreasing the polling interval, but there is an
increased powerd cpu load: at 100ms polling interval the cpu load is
to an astonishing 20% circa, which i think it's too much for a normal
use. The sampling rate with ondemand governor in linux kernel is 10ms
but cpufreqd is at 0.6% on average cpu load.
powerd is not intended to do high speed polling. If you do that, your
system will almost never be idle and so we can't save power via Cx.
We don't need high speed sampling right now, we need a predictive
algorithm. So until someone implements this, it's moot.
--
Nate
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