[Intel-gfx] [PATCH i-g-t 06/11] tests/perf: make enable-disable more reliable

[Lionel Landwerlin]

On 04/08/17 12:44, Chris Wilson wrote:
> Quoting Lionel Landwerlin (2017-08-04 12:20:35)
>> Estimation of the amount of reports can only refer to periodic ones,
>> as context switch reports completely depend on what happens on the
>> system. Also generate some load to prevent clock frequency changes to
>> impact our measurement.
> If clock frequency is a fundamental invariant required for the test,
> set the clock frequency via sysfs:
> 	/sys/class/drm/card0/gt_(min|max|boost)_freq_mhz
> -Chris
>
>

I haven't tried setting the boost value, but settings min&max to the 
maximum the device can do didn't seem to make any difference.
Reading the current frequency file would sometimes report values 200Mhz 
below what was put in the min...