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

[Jesse Barnes]

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.

-- 
Jesse Barnes, Intel Open Source Technology Center