[PATCH libdrm] radeon: use SAMPLE_SPLIT=2 for better MSAA perf on EG/CM
Marek Olšák
maraeo at gmail.com
Thu May 26 13:38:59 UTC 2016
From: Marek Olšák <marek.olsak at amd.com>
---
radeon/radeon_surface.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/radeon/radeon_surface.c b/radeon/radeon_surface.c
index 5ec9745..1424660 100644
--- a/radeon/radeon_surface.c
+++ b/radeon/radeon_surface.c
@@ -957,8 +957,10 @@ static int eg_surface_best(struct radeon_surface_manager *surf_man,
}
surf->stencil_tile_split = 64;
} else {
- /* tile split must be >= 256 for colorbuffer surfaces */
- surf->tile_split = MAX2(surf->nsamples * surf->bpe * 64, 256);
+ /* tile split must be >= 256 for colorbuffer surfaces,
+ * SAMPLE_SPLIT = tile_split / (bpe * 64), the optimal value is 2
+ */
+ surf->tile_split = MAX2(2 * surf->bpe * 64, 256);
if (surf->tile_split > 4096)
surf->tile_split = 4096;
}
--
2.7.4
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