On 04/ 6/11 02:36 AM, Li, Aubrey wrote:
poll mode is more lazy to speed down, is this an idle system?(what's platform?)
Idle desktop - metacity, thunderbird, gnome-terminal
i7 980X + eVGA X58 3X SLI motherboard (latest BIOS)
if so, you should wait until the frequency speed down to the lowest one and
read the power usage again.
If I wait long enough it settles to around 5W above event-mode,
but the power meter jumps around quite a bit.
It looks like xcall/pstate transition is gone. I suspect latest scheduler
change makes
the system more aggressive to race to idle.
I attached a dtrace script to capture the idle/non-idle transition number. This
is not
p/c-state related, and not powertop related. I saw a big regression against
previous
build. Please have a try on your system and let me know the result.
When in poll-mode:
# ./idle-state.d
dtrace: script './idle-state.d' matched 5 probes
dtrace: 221 dynamic variable drops with non-empty dirty list
CPU ID FUNCTION:NAME
7 75543 :tick-5sec
2425903
7 75543 :tick-5sec
2566395
7 75543 :tick-5sec
2556586
dtrace: 339 dynamic variable drops with non-empty dirty list
7 75543 :tick-5sec
2350252
dtrace: 9 dynamic variable drops with non-empty rinsing list
dtrace: 192 dynamic variable drops with non-empty dirty list
7 75543 :tick-5sec
2354720
dtrace: 52 dynamic variable drops with non-empty dirty list
7 75543 :tick-5sec
2565431
dtrace: 182 dynamic variable drops with non-empty dirty list
7 75543 :tick-5sec
2706685
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