Aubrey Li wrote:
On Sun, Apr 26, 2009 at 9:44 PM, Mark Haywood <[email protected]> wrote:
Should've been more specific in my reply, so:
% vi /etc/power.conf # Change to poll-mode
% pfexec pmconfig
% pfexec powertop # shows proc. always at max speed % pfexec reboot #
After the reboot, powertop shows proc. at lower freq.
It is either a bug or your system isn't idle enough for poll-mode to lower
the freq. either. I have successfully switched event-mode and poll-mode many
times without a reboot.
I checked it just now on my system(OpenSolaris200906-snv111),
it works properly. When change to poll-mode, you'd better to set the
"cpu-threshold" to "1s". The default scanning cycle is 15s, which means
you need to wait for a while(>15s) to see the frequency transition.
============================
cpupm enable poll-mode
cpu-threshold 1s
============================
After issue "pmconfig", you should see the lowest frequency residency
in powertop if
your system is idle.
Some observations after some experimentation on my systems. All were
done with the system effectively 'idle'. X was up with a GNOME session,
and compiz was on, but most other apps that I usually run were down. I
was using gnome-terminal.
If I switch to event-mode, powertop does occasionally, for a refresh,
show the pstate changing from something other than the highest
frequency. Observing it for a minute or so shows that it only happens
maybe 10-20% of the time. via mpstat 5, both cores show a median of
about 97% idle (just eyeball observations)
In poll-mode with cpu-threshold set to 3s, I see the pstate changing
much more frequently. I also see pstates other than just the highest
frequency and the lowest frequency.
Like others have observed, powertop only ever shows me the 100% in any
one pstate. I believe that's where someone mentioned a bug.
So I guess my question is, how should I get data to know if my usage
pattern/system is best in event-mode or poll-mode?
Thanks in advance,
- Matt
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