[Bug 68716] [SNA][HSW] Dragging windows in Gnome3 overview is less smooth than with UXA

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68716

--- Comment #10 from Chris Wilson <chris at chris-wilson.co.uk> ---
The issue appears to be that the overview panel redraw is slow and it misses
the 60Hz refresh when double-buffered. UXA does tripling buffering by default,
and I just reverted SNA back to double-buffering for the compositor (at the
behest of the gnome-shell devs - because it should allow them to do smoother
animations!). 

Option "TripleBuffer" "false"

should make UXA behave the same. I'm digging deeper into exactly why this
misses, based on this SNB machine and your results, I think it is due to the
semaphore interlock following the flip stalls the GPU. Which would also explain
the regression with updating mesa. (But that seems an awfully long stall.)

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