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radv: enable GS_FAST_LAUNCH=2 by default for RDNA3 APUs (Phoenix)

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GS_FAST_LAUNCH=1 shouldn't be used on GFX11 but it's still needed for
dGPUs (eg. NAVI31) because it destroys performance for unknown reasons.

On RDNA3 APUs, GS_FAST_LAUNCH=2 seems to be required for working
mesh shaders and performance is fine. There is possibly a firmware bug
on APUs that would explain why GS_FAST_LAUNCH=1 doesn't work on Phoenix.

Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/10583
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/10397
Cc: mesa-stable
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
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Samuel Pitoiset 2024-02-14 16:54:50 +00:00 • committed by Denis
parent 8fe6a8d395
commit 68b3e0c078
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2 changed files with 13 additions and 2 deletions
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docs/envvars.rst
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@ -1340,6 +1340,8 @@ RADV driver environment variables
rt extensions with older hardware.
``gewave32``
enable wave32 for vertex/tess/geometry shaders (GFX10+)
``gsfastlaunch2``
use GS_FAST_LAUNCH=2 for Mesh shaders (GFX11+ dGPUs only)
``localbos``
enable local BOs
``nosam``