[Intel-gfx] [PATCH 0/9] GPU-bound energy efficiency improvements for the intel_pstate driver.

[Srinivas Pandruvada]

On Tue, 2018-04-17 at 15:03 +0100, Chris Wilson wrote:
> I have to ask, if this is all just to work around iowait triggering
> high
> frequencies for GPU bound applications, does it all just boil down to
> i915 incorrectly using iowait. Does this patch set perform better
> than
> 
> diff --git a/drivers/gpu/drm/i915/i915_request.c
> b/drivers/gpu/drm/i915/i915_request.c
> index 9ca9c24b4421..7e7c95411bcd 100644
> --- a/drivers/gpu/drm/i915/i915_request.c
> +++ b/drivers/gpu/drm/i915/i915_request.c
> @@ -1267,7 +1267,7 @@ long i915_request_wait(struct i915_request *rq,
>                         goto complete;
>                 }
>  
> -               timeout = io_schedule_timeout(timeout);
> +               timeout = schedule_timeout(timeout);
>         } while (1);
>  
>         GEM_BUG_ON(!intel_wait_has_seqno(&wait));
> 
> Quite clearly the general framework could prove useful in a broader
> range of situations, but does the above suffice? (And can be
> backported
> to stable.)

Definitely a very good test to do.

Thanks,
Srinivas

> -Chris