[tesla-dev] powertop man page - newbie question

[Li, Aubrey]

Chen, Luojia wrote:

> Hi,
> 
> While checking the powertop man page, I didn't see the detail
> explanation for each outputs of the powertop? Especially:
> 
> what are the means of the output data for "Cn, Avg, residency,
> P-states" And the data in "Top causes for wakeups", such as:
> 21.2% (100.0) ->what is 100.0 for?

Cn - processor power state, for now, C0 - active state, C1 - idle state.
Avg - the average time the processor in the c-state
Residency - in the sampling period, the percent is how long the 
	processor in each c-state

Pn - processor performance state. the percent is how long the processor
	run under each frequency.

Top causes - 21.2% (100), here "100" is the times per second this event
	generate interrupt, that is, wake cpu up. "21.2%" is the ratio
of 
	this events interrupt times to the total interrupt times.

> 
> And what are the power states? etc.
Please refer to the ACPI specification for the more information.
http://www.acpi.info/

Thanks for the attention to PowerTOP, :-)
-Aubrey