Re: [PATCH v2 0/3] cpufreq: Allow drivers to receive more information from the governor

Rafael J. Wysocki
2020-12-21T10:42:15Z

On Thu, Dec 17, 2020 at 4:27 PM Doug Smythies <dsmythies@telus.net> wrote:
>
> On 2020.12.14 12:02 Rafael J. Wysocki wrote:
>
> > Hi,
>
> Hi Rafael,
>
> V2 test results below are new, other results are partially re-stated:
>
> For readers that do not want to read on, I didn't find anything different than with
> the other versions. This was more just due diligence.

Thanks a lot for the data, much appreciated as always!

> Legend:
>
> hwp: Kernel 5.10-rc6, HWP enabled; intel_cpufreq
> rfc (or rjw): Kernel 5.10-rc6 + this patch set, HWP enabled; intel_cpu-freq; schedutil
> no-hwp: Kernel 5.10-rc6, HWP disabled; intel_cpu-freq
> acpi (or acpi-cpufreq): Kernel 5.10-rc6, HWP disabled; acpi-cpufreq; schedutil
> patch: Kernel 5.10-rc7 + V1 patch set, HWP enabled; intel_cpu-freq; schedutil
> v2: Kernel 5.10-rc7 + V2 patch set, HWP enabled; intel_cpu-freq; schedutil
>
> Fixed work packet, fixed period, periodic workflow, load sweep up/down:
>
> load work/sleep frequency: 73 Hertz:
>
> hwp: Average: 12.00822 watts
> rjw: Average: 10.18089 watts
> no-hwp: Average: 10.21947 watts
> acpi-cpufreq: Average: 9.06585 watts
> patch: Average: 10.26060 watts
> v2: Average: 10.50444
>
> load work/sleep frequency: 113 Hertz:
>
> hwp: Average: 12.01056
> rjw: Average: 10.12303
> no-hwp: Average: 10.08228
> acpi-cpufreq: Average: 9.02215
> patch: Average: 10.27055
> v2: Average: 10.31097
>
> load work/sleep frequency: 211 Hertz:
>
> hwp: Average: 12.16067
> rjw: Average: 10.24413
> no-hwp: Average: 10.12463
> acpi-cpufreq: Average: 9.19175
> patch: Average: 10.33000
> v2: Average: 10.39811
>
> load work/sleep frequency: 347 Hertz:
>
> hwp: Average: 12.34169
> rjw: Average: 10.79980
> no-hwp: Average: 10.57296
> acpi-cpufreq: Average: 9.84709
> patch: Average: 10.67029
> v2: Average: 10.93143
>
> load work/sleep frequency: 401 Hertz:
>
> hwp: Average: 12.42562
> rjw: Average: 11.12465
> no-hwp: Average: 11.24203
> acpi-cpufreq: Average: 10.78670
> patch: Average: 10.94514
> v2: Average: 11.50324
>
>
> Serialized single threaded via PIDs per second method:
> A.K.A fixed work packet, variable period
> Results:
>
> Execution times (seconds. Less is better):
>
> no-hwp:
>
> performance: Samples: 382 ; Average: 10.54450 ; Stand Deviation: 0.01564 ; Maximum: 10.61000 ; Minimum: 10.50000
>
> schedutil: Samples: 293 ; Average: 13.73416 ; Stand Deviation: 0.73395 ; Maximum: 15.46000 ; Minimum: 11.68000
> acpi: Samples: 253 ; Average: 15.94889 ; Stand Deviation: 1.28219 ; Maximum: 18.66000 ; Minimum: 12.04000
>
> hwp:
>
> schedutil: Samples: 380 ; Average: 10.58287 ; Stand Deviation: 0.01864 ; Maximum: 10.64000 ; Minimum: 10.54000
> patch: Samples: 276 ; Average: 14.57029 ; Stand Deviation: 0.89771 ; Maximum: 16.04000 ; Minimum: 11.68000
> rfc: Samples: 271 ; Average: 14.86037 ; Stand Deviation: 0.84164 ; Maximum: 16.04000 ; Minimum: 12.21000
> v2: Samples: 274 ; Average: 14.67978 ; Stand Deviation: 1.03378 ; Maximum: 16.07000 ; Minimum: 11.43000
>
> Power (watts. More indicates higher CPU frequency and better performance. Sample time = 1 second.):
>
> no-hwp:
>
> performance: Samples: 4000 ; Average: 25.41355 ; Stand Deviation: 0.22156 ; Maximum: 26.01996 ; Minimum: 24.08807
>
> schedutil: Samples: 4000 ; Average: 12.58863 ; Stand Deviation: 5.48600 ; Maximum: 25.50934 ; Minimum: 7.54559
> acpi: Samples: 4000 ; Average: 9.57924 ; Stand Deviation: 5.41157 ; Maximum: 25.06366 ; Minimum: 5.51129
>
> hwp:
>
> schedutil: Samples: 4000 ; Average: 25.24245 ; Stand Deviation: 0.19539 ; Maximum: 25.93671 ; Minimum: 24.14746
> patch: Samples: 4000 ; Average: 11.07225 ; Stand Deviation: 5.63142 ; Maximum: 24.99493 ; Minimum: 3.67548
> rfc: Samples: 4000 ; Average: 10.35842 ; Stand Deviation: 4.77915 ; Maximum: 24.95953 ; Minimum: 7.26202
> v2: Samples: 4000 ; Average: 10.98284 ; Stand Deviation: 5.48859 ; Maximum: 25.76331 ; Minimum: 7.53790
>
>