[ACTIVITY] Power Management WG Weekly Status report week ending 2011-09-02

[Amit Kucheria]

On Fri, Sep 2, 2011 at 6:07 PM, Christian Robottom Reis <kiko at linaro.org> wrote:
> On Thu, Sep 01, 2011 at 02:22:03PM -0500, Mounir Bsaibes wrote:
>>  * Made hotplug power measurements on st-e u8500 platform
>>    * mp3 playback test showed between 7 to 8% power improvement
>>    * cpuhotplug - For Linux idle case, no visible improvement as power is
>> already very low
>
> This is using hotplug versus plain cpuidle -- and if so, does this mean
> that the proper fix is extending cpuidle to go to the lowest power state?

It isn't extending cpuidle but more like implementing the cpuidle
platform-specific driver correctly.

What I find more interesting is that a low-power mp3 usecase (display
off, play mp3 at half volume, etc.) still saves 7-8% with hotplug.
It'd be worth looking at the scheduler traces to see if the second
core is coming into play in the mp3 usecase. Vincent?

>>  * Re-writing cpuidle driver
>
> For which platforms?

For i.MX5. Rob what is the status of posting this to the list?