[Intel-gfx] vlv punit and sideband tidy
chris at chris-wilson.co.uk
Thu Mar 8 16:49:21 UTC 2018
Quoting Rogozhkin, Dmitry V (2018-03-07 20:39:16)
> On Wed, 2018-03-07 at 19:41 +0000, Chris Wilson wrote:
> > Mika
> > believes that if we keep the cpu in C0 whilst the gpu is busy, then
> > it
> > behaves much better -- but that is a very tough sell
> Chris, Mika, I wonder does i915 driver tries to keep CPU in C0 at the
> moment already or you just consider this?
That is what Mika looked at, setting C0 while the GPU is marked busy.
Iirc, he was satisfied with the result, I just objected on the grounds
that keeping the CPU at max frequency was unlikely to win any friends in
HTPC. (Although, maybe my gut feeling here is backwards and killawatt
> CPU while gpu is busy, could you, please, clarify what exactly and
> point me to the code/key patches? Please, answer from BDW/SKL gen
> perspective rather than VLV.
Basically you do pm_qos_update_request() from i915_request::mark_busy().
More information about the Intel-gfx