[Bug 76321] [SNB/IVB DRI3] OSD's from Gnome-shell hangs or crashes the Intel driver

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76321

--- Comment #19 from martin.kamleithner at gmail.com ---
(In reply to Eero Tamminen from comment #18)
> Main performance difference between DRI2 & DRI3 should come only in
> synthetic benchmarks where you go much over 60 FPS, with Vsync it should not
> be visible to user. That was about memory overhead and how perf is visible
> to the application.
> 
> There are also differences in how frames get to screen after application has
> rendered them to the double/triple buffer.

You are right, the performance difference is not from DRI2 vs DRI3, but from
SNA vs UXA: Switching back to UXA brings back good performance, but
reintroduces the bug.


The performance drop is not 100% reproduceable, it only happens on fullscreen
and only sometimes with various games (E.g. Binding of Isaac:Rebirth, Super
Hexagon), but when it happens, it is very noticeable (below 30 fps).
I don't know how to measure fps on Linux, but the fps drop is definitely there.

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