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authorEric Anholt <[email protected]>2013-01-18 18:18:57 -0800
committerEric Anholt <[email protected]>2013-01-29 11:25:14 +1100
commit99fe2b36cf5f9ff221be8de42c8649b26707972d (patch)
treeeca09101b3cc07ce23997fd65c9cf1f60b6735c4 /docs
parente1598cb642334c809e6ec219d793e7bc85a213de (diff)
intel: Use a CPU map of the batch on LLC-sharing architectures.
Before, we were keeping a CPU-only buffer to accumulate the batchbuffer in, which was an improvement over mapping the batch through the GTT directly (since any readback or other failure to stream through write combining correctly would hurt). However, on LLC-sharing architectures we can do better by mapping the batch directly, which reduces the cache footprint of the application since we no longer have this extra copy of a batchbuffer around. Improves performance of GLBenchmark 2.1 offscreen on IVB by 3.5% +/- 0.4% (n=21). Improves Lightsmark performance by 1.1 +/- 0.1% (n=76). Improves cairo-gl performance by 1.9% +/- 1.4% (n=57). No statistically significant difference in GLB2.1 on SNB (n=37). Improves cairo-gl performance by 2.1% +/- 0.1% (n=278).
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