[Intel-gfx] [PATCH] drm/i915: Prefer to pageflip on the active ring on IvyBridge

Chris Wilson chris at chris-wilson.co.uk
Thu Apr 26 21:42:15 CEST 2012

On Mon, 16 Apr 2012 15:29:41 +0100, Chris Wilson <chris at chris-wilson.co.uk> wrote:
> IvyBridge has the ability to pageflip from either the Render or Blitter
> rings. Scheduling the pageflip on the active ring (if the new scanout is
> being rendered on either pipeline) saves inserting a semaphore (if
> available) and forcing a stall on both pipelines. We presume that the
> current scanout is inactive.

As a follow-up to my own suggestion; don't even think of pageflipping from
the render ring, it is full of disappointment.

Chris Wilson, Intel Open Source Technology Centre

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