On Sun, Dec 04, 2011 at 12:26:41PM +0000, Chris Wilson wrote: > We try to avoid writing the relocations through the uncached GTT, if the > buffer is currently in the CPU write domain and so will be flushed out to > main memory afterwards anyway. Also on SandyBridge we can safely write > to the pages in cacheable memory, so long as the buffer is LLC mapped. > In either of these caches, we therefore do not need to force the > reallocation of the buffer into the mappable region of the GTT, reducing > the aperture pressure. > > Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk> > Cc: Daniel Vetter <daniel at ffwll.ch> > --- > > v2: We need to wait on LLC-mapped buffers before performing the relocs. > This is neatly done by making the GTT/CPU paths symmetric. > > Should fix i-g-t/tests/gem_reloc_vs_gpu when the test case itself is > debugged ;-) Testcase is now fixed up and does indeed pass with this patch. Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch> -- Daniel Vetter Mail: daniel at ffwll.ch Mobile: +41 (0)79 365 57 48
