[Intel-gfx] hsw rps values regress RPS on Macbook Air

[Eric Anholt]

Jesse Barnes <jbarnes at virtuousgeek.org> writes:

> On Tue, 09 Oct 2012 13:05:54 -0700
> Eric Anholt <eric at anholt.net> wrote:
>
>> On my new MBA with danvet's drm-intel-next-queued, I'm not getting
>> working RPS.  vblank_mode=0 glxgears never ups the frequency, and
>> vblank_mode=0 openarena only makes it up to 500mhz.  Reverting
>> 1ee9ae3244c4789f3184c5123f3b2d7e405b3f4c gets the machine to responsive
>> RPS: fully on while the GPU is busy, fully lowered when it's not.
>> 
>> Since we're always just looking for all-on or all-off and never see
>> workloads that actually want to be somewhere in between, could we please
>> just move to race to idle for RPS?
>
> Ramping to the max freq is fine for benchmarking.  But for normal
> vblank throttled activity, using the lowest freq (assuming it's
> above our nominal freq) that can hit the refresh is the right answer
> from a power perspective.

Have you seen any workloads where a middle frequency value is actually
chosen by the current RPS system?
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