On Thu, May 17, 2018 at 08:41:32AM -0700, Srinivas Pandruvada wrote: > One more point to note. Even if we calculate some utilization based on > the freq-invariant and arrive at a P-state, we will not be able to > control any P-state in turbo region (not even as a cap) on several > Intel processors using PERF_CTL MSRs.
Right, but don't we need to set the PERF_CTL to max P in order to access the turbo bins? So we still need to compute a P state, but as soon as we reach max P, we're done. And its not as if setting anything below max P is a firm setting either anyway, its hints all the way down.
