Re: [PATCH v2] drm/i915/bdw: BDW Software Turbo

Chris Wilson
2014-07-10T19:08:01Z

On Thu, Jul 10, 2014 at 11:42:59AM -0700, Sun, Daisy wrote:
>
> GT is not going to run at a single frequency all the time actually.
> It starts from a single frequency, and then will dynamically adjust
> according to the GT utilization, either go up or down.
> From this perspective, SW turbo function the same as the HW turbo.

Urm, read your code again.

> For the algorithm, we did go over the design forum before implementation.
> What kind of improvement is expected? Please let me know if any
> important case is not taken into account. Thanks.

You have no faststart or boost strategy, so typical desktop usage will
feel very laggy. For a large number of use cases you never change
freequency.
-Chris

--
Chris Wilson, Intel Open Source Technology Centre