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asahi: Add ASAHI_MESA_DEBUG=nowc flag

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Add a debug flag to disable write-combining as a performance hack. This may help
diagnose slowness with glReadPixels() heavy workloads like screen capture.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23480>
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Alyssa Rosenzweig 2023-05-12 08:13:22 -04:00 • committed by Marge Bot
parent 3a0d1f83d5
commit 389c0fdc7c
3 changed files with 11 additions and 0 deletions
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4
docs/envvars.rst
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@ -1633,6 +1633,10 @@ Asahi driver environment variables
possible) or added in the Mesa-wide driconf (if closed source).
``dirty``
In debug builds only: disable dirty tracking optimizations.
``nowc``
Disable write-combining (force all allocations to be write-through). This
may be useful for diagnosing certain performance issues. Note imported
buffers may still be write-combined.
.. envvar:: AGX_MESA_DEBUG