On Fri, Sep 2, 2011 at 6:07 PM, Christian Robottom Reis <k...@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? _______________________________________________ linaro-dev mailing list linaro-dev@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-dev
