[Intel-gfx] [PATCH 4/5] drm/i915: Modifying RC6 Promotion timer for Media workloads.

[Chris Wilson]

On Thu, Feb 26, 2015 at 08:46:57PM +0530, deepak.s at linux.intel.com wrote:
> From: Deepak S <deepak.s at linux.intel.com>
> 
> In normal cases, RC6 promotion timer is 1700us/500us. This will
> result in more time spent in C1 state. For more residency in C6
> in case of media workloads, this is changed to 250us.
> Not doing this for 3D workloads as too many C6-C0 transition
> delays can result in performance impact

I would prefer it if you extended intel_mark_busy() to note the source of
work, and so extended the busy/idle tracking per-ring with the
appropriate hooks for vlv to modify RPS, like how we already do for the
general gen6_rps_busy and gen6_rps_idle.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre