[Intel-gfx] [PATCH] tests/gem_ringfill: Exercise all rings

[Chris Wilson]

On Mon, 20 Feb 2012 22:22:00 +0000, Chris Wilson <chris at chris-wilson.co.uk> wrote:
> On SandyBridge, the BLT commands were split from the RENDER commands as
> well as the BSD split inherited from Ironlake. So we need to make sure
> we do exercise each ring, and in order to do so we also need to make
> sure each batch takes longer to execute than it takes for us to
> submit it.

Whilst this found the bug, it does presume the BLT and RENDER copy are
equally fast. So on a SNB without the autoreported head, it fails to
fill the BLT ring as the untiled RENDER copy is far too slow.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre