Messages in this thread | | | Date | Thu, 6 Jan 2022 22:58:31 +0100 (CET) | From | Julia Lawall <> | Subject | Re: cpufreq: intel_pstate: map utilization into the pstate range |
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On Thu, 6 Jan 2022, srinivas pandruvada wrote:
> On Thu, 2022-01-06 at 21:43 +0100, Julia Lawall wrote: > > > > All the turbostat output and graphs I have sent recently were > > > > just > > > > for > > > > continuous spinning: > > > > > > > > for(;;); > > > > > > > > Now I am trying running for the percentage of the time > > > > corresponding > > > > to > > > > 10 / P for pstate P (ie 0.5 of the time for pstate 20), and then > > > > sleeping, > > > > to see whether one can just add the sleeping power consumption of > > > > the > > > > machine to compute the efficiency as Rafael suggested. > > > > > > > Before doing comparison try freezing uncore. > > > > > > wrmsr -a 0x620 0x0808 > > > > > > to Freeze uncore at 800MHz. Any other value is fine. > > > > Thanks for the suggestion. What is the impact of this? > Uncore scales based on its own heuristics based in P-state change and > works in package scope. So to actually see the effect of P-state change > on energy you can remove variability of uncore power.
OK, thanks. I will try both options.
julia
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