Messages in this thread | | | Date | Thu, 17 May 2018 18:16:49 +0200 | From | Peter Zijlstra <> | Subject | Re: [RFC/RFT] [PATCH 02/10] cpufreq: intel_pstate: Conditional frequency invariant accounting |
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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.
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