Messages in this thread | | | Date | Fri, 5 Sep 2014 13:11:22 +0530 | Subject | Re: [PATCH V2 0/2] cpufreq/powernv: Set core pstate to a minimum just before hotplugging it out | From | Viresh Kumar <> |
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On 5 September 2014 13:09, Preeti U Murthy <preeti@linux.vnet.ibm.com> wrote: > Today cpus go to winkle when they are offlined. Since it is the deepest > idle state that we have, it is expected to save good amount of power as compared > to online state, where cores can enter nap/fastsleep only which are > shallower idle states. > However we observed no powersavings with winkle as compared to nap/fastsleep > and traced the problem to the pstate of the core being kept at a high even > when the core is offline. This can keep the socket pstate high, thus burning > power unnecessarily. This patchset fixes this issue. > > Changes in V2: Changed smp_call_function_any() to smp_call_function_single() in Patch[2/2]
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
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