[Bug 110781] Radeon: heavy r300 performance drop regression between 11.x and 19.x

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110781

Richard Thier <u9vata at gmail.com> changed:

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--- Comment #26 from Richard Thier <u9vata at gmail.com> ---
Created attachment 144439
  --> https://bugs.freedesktop.org/attachment.cgi?id=144439&action=edit
Hacky fix working also for 19.x versions

I can confirm the problem with the "possible fix" is because
radeon_get_heap_index does not handle both GTT and VRAM domains at the same
time, but r300 still asks for that.

Added a hacky fix that works on 19.x versions but forces VRAM domain. This
highlights problematic areas for the new versions. I think this latter issue is
because of bitrot happening with r300 as now we re-enabled a code path that was
never happening after the slowdown in 17.x as analysed before.

PS.: Of course the "possible fix" still works when applied directly to the 17.x
commit that made things slow and that is the better direction, just not to the
latest code because of this issue.

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