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SubjectRe: [Patch v6 0/7] Introduce Thermal Pressure
On Wed, Dec 11, 2019 at 11:11:41PM -0500, Thara Gopinath wrote:
> Test Results
>
> Hackbench: 1 group , 30000 loops, 10 runs
> Result SD
> (Secs) (% of mean)
> No Thermal Pressure 14.03 2.69%
> Thermal Pressure PELT Algo. Decay : 32 ms 13.29 0.56%
> Thermal Pressure PELT Algo. Decay : 64 ms 12.57 1.56%
> Thermal Pressure PELT Algo. Decay : 128 ms 12.71 1.04%
> Thermal Pressure PELT Algo. Decay : 256 ms 12.29 1.42%
> Thermal Pressure PELT Algo. Decay : 512 ms 12.42 1.15%
>
> Dhrystone Run Time : 20 threads, 3000 MLOOPS
> Result SD
> (Secs) (% of mean)
> No Thermal Pressure 9.452 4.49%
> Thermal Pressure PELT Algo. Decay : 32 ms 8.793 5.30%
> Thermal Pressure PELT Algo. Decay : 64 ms 8.981 5.29%
> Thermal Pressure PELT Algo. Decay : 128 ms 8.647 6.62%
> Thermal Pressure PELT Algo. Decay : 256 ms 8.774 6.45%
> Thermal Pressure PELT Algo. Decay : 512 ms 8.603 5.41%

What is the conclusion, if any from these results? Clearly thermal
pressuse seems to help, but what window? ISTR we default to 32ms, which
is a wash for drystone, but sub-optimal for hackbench.


Anyway, the patches look more or less acceptible, just a bunch of nits,
the biggest being the fact that even if an architecture does not support
this there is still the code and runtime overhead.

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