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
