[Mesa-dev] [PATCH] i965/tex: Don't pass samples to miptree_create_for_teximage
Jason Ekstrand
jason at jlekstrand.net
Sat Aug 19 18:07:35 UTC 2017
In 76e2f390f9863a35, when Topi switched num_samples from 0 to 1 for
single-sampled, he accidentally switched the last parameter in the call
to miptree_create_for_teximage from 0 to 1 thinking it was num_samples
when it was actually layout_flags. Switching from 0 to 1 added the
MIPTREE_LAYOUT_ACCELERATED_UPLOAD flag which causes us to allocate a
busy BO instead of an idle one. This caused the subsequent CPU upload
to consistently stall. The end result was a 15% performance drop in the
SynMark v7 DrvRes microbenchmark. This restores the old behavior and
fixes the performance regression.
Cc: Kenneth Graunke <kenneth at whitecape.org>
Cc: Topi Pohjolainen <topi.pohjolainen at intel.com>
Fixes: 76e2f390f9863a356d1419982dec705260d67eff
Bugzilla: https://bugs.freedesktop.org/102260
Cc: mesa-stable at lists.freedesktop.org
---
src/mesa/drivers/dri/i965/intel_tex.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/mesa/drivers/dri/i965/intel_tex.c b/src/mesa/drivers/dri/i965/intel_tex.c
index 890c82d..94a7ad3 100644
--- a/src/mesa/drivers/dri/i965/intel_tex.c
+++ b/src/mesa/drivers/dri/i965/intel_tex.c
@@ -94,7 +94,7 @@ intel_alloc_texture_image_buffer(struct gl_context *ctx,
} else {
intel_image->mt = intel_miptree_create_for_teximage(brw, intel_texobj,
intel_image,
- 1 /* samples */);
+ MIPTREE_CREATE_DEFAULT);
if (!intel_image->mt)
return false;
--
2.5.0.400.gff86faf
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