[Bug 38800] glXSwapBuffersMscOML is slow on AMD Fusion but not on Intel 945 w/Atom

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=38800

--- Comment #32 from Jerome Glisse <glisse at freedesktop.org> 2011-07-07 07:11:43 PDT ---
Well i can think of similar bad case in the other way.

-wait for vblank
-wait for bo put us in next vblank
-program reg flip happen on this frame
-irq reporting report on next vblank

So we are off by one frame on the timestamp.

To me it seems more logic to first make sure that the potentialy longer wait
(bo_wait is unbound while vblank wait is bound for any human video mode) is
done first and then do the smaller one. Yes can we miss the next vblank but so
could we with bo wait after and with bo wait after we might do bad reporting on
the timestamp.

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