https://bugs.freedesktop.org/show_bug.cgi?id=97879
--- Comment #71 from Marek Olšák <mar...@gmail.com> ---
The current heuristic in Mesa is that if a buffer is not mapped for read, Mesa
doesn't enable CPU caches for the mapping. It's usually an optimal solution for
write-only buffer uploads.
Enabling CPU caches for mapped buffers adds a lot of inefficiencies, so it
should be avoided.
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