[Mesa-dev] [PATCH] loader/dri3: Overhaul dri3_update_num_back

[Keith Packard]

Michel Dänzer <michel at daenzer.net> writes:

> From: Michel Dänzer <michel.daenzer at amd.com>
>
> Always use 3 buffers when flipping. With only 2 buffers, we have to wait
> for a flip to complete (which takes non-0 time even with asynchronous
> flips) before we can start working on the next frame. We were previously
> only using 2 buffers for flipping if the X server supports asynchronous
> flips, even when we're not using asynchronous flips. This could result
> in bad performance (the referenced bug report is an extreme case, where
> the inter-frame stalls were preventing the GPU from reaching its maximum
> clocks).

Makes sense to me.

-- 
-keith
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