On Thu, Oct 22, 2020 at 1:58 PM Peter Zijlstra <pet...@infradead.org> wrote: > > On Thu, Oct 22, 2020 at 01:30:01PM +0200, Rafael J. Wysocki wrote: > > > Many people use intel_pstate in the active mode with HWP enabled too. > > We now have HWP-passive supported, afaict. So we should discourage that.
Which is kind of hard, because plain HWP does better in some cases, especially performance-focused. I am still not sure why this is the case given how the passive mode with HWP enabled is implemented, but that's what Srinivas sees in his tests. > That is; I'll care less and less about people not using schedutil as > time goes on. > > > Arguably, that doesn't need to compute the effective utilization, so I > > guess it is not relevant for the discussion here, but it is not > > negligible in general. > > Why not? cpufreq-cooling should still be able to throttle the system by > setting HWP.Highest_Performance no? Well, in theory, but it is not used on x86 AFAICS. > In which case it still needs an energy estimate.
