Brian Paul
fbd32a04da
Commit 582bf4d9 turned on write-combining for most (all?) memory
allocations. This caused a fairly large performance drop in some of
our VMware tests (application traces, such as Windows Metro Paint).
This patch adds a third memory type configuration: DEVICE_LOCAL,
HOST_VISIBLE, HOST_COHERENT. This is uncached. Then, in
anv_AllocateMemory() we only use write-combining for this uncached
type. This memory type is found in the Intel Windows Vulkan driver.
And according to
https://asawicki.info/news_1740_vulkan_memory_types_on_pc_and_how_to_use_them
uncached memory correlates to write-combined memory.
This fixes our performance regression (and actually produced the
fastest ever results for our test suite).
Signed-off-by: Brian Paul <brianp@vmware.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20770>
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