[Intel-gfx] [PATCH 3/3] drm/i915: Priority boost switching to an idle ring

Chris Wilson chris at chris-wilson.co.uk
Mon Jan 23 08:48:39 UTC 2017

On Mon, Jan 23, 2017 at 10:39:51AM +0200, Joonas Lahtinen wrote:
> On la, 2017-01-21 at 09:25 +0000, Chris Wilson wrote:
> > In order to maximise concurrency between engines, if we queue a request
> > to a current idle ring, reorder its dependencies to execute that request
> > as early as possible and ideally improve occupancy of multiple engines
> > simultaneously.
> > 
> > Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Any specific testcase where this helped?

Measurably? Not yet. I can observe it having some effect in watching the
priority queue when using mesa. But the actual test case under
investigation I don't hold much hope for - manual inspection there
suggests that the dependency chain should extend beyond the stall across

(It is a solution searching for a problem... Eeek.)

Chris Wilson, Intel Open Source Technology Centre

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