On 15/09/2020 19:24, Matthias Kaehlcke wrote: > +Thermal folks > > Hi Rajendra, > > On Tue, Sep 15, 2020 at 11:14:00AM +0530, Rajendra Nayak wrote: >> Hi Rob, >> >> There has been some discussions on another thread [1] around the DPC (dynamic-power-coefficient) values >> for CPU's being relative vs absolute (based on real power) and should they be used to derive 'real' power >> at various OPPs in order to calculate things like 'sustainable-power' for thermal zones. >> I believe relative values work perfectly fine for scheduling decisions, but with others using this for >> calculating power values in mW, is there a need to document the property as something that *has* to be >> based on real power measurements? > > Relative values may work for scheduling decisions, but not for thermal > management with the power allocator, at least not when CPU cooling devices > are combined with others that specify their power consumption in absolute > values. Such a configuration should be supported IMO. The energy model is used in the cpufreq cooling device and if the sustainable power is consistent with the relative values then there is no reason it shouldn't work. -- <http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook | <http://twitter.com/#!/linaroorg> Twitter | <http://www.linaro.org/linaro-blog/> Blog
