Michel Dänzer <mic...@daenzer.net> writes: > From: Michel Dänzer <michel.daen...@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). > > I couldn't measure any performance boost using 4 buffers with flipping. > Performance actually seemed to go down slightly, but that might have > been just noise. > > Without flipping, a single back buffer is enough for swap interval 0, > but we need to use 2 back buffers when the swap interval is non-0, > otherwise we have to wait for the swap interval to pass before we can > start working on the next frame. This condition was previously reversed. > > Cc: "12.0 11.2" <mesa-sta...@lists.freedesktop.org> > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=97260 > Signed-off-by: Michel Dänzer <michel.daen...@amd.com>
Reviewed-by: Eric Anholt <e...@anholt.net>
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