[Bug 80705] [IVB/HSW/BYT-M/BDW] GpuTest_v0.5_triangle performance slower by 10%~50% in fullscreen than in windowed & composited mode

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Mon Aug 10 01:05:47 PDT 2015


https://bugs.freedesktop.org/show_bug.cgi?id=80705

--- Comment #5 from Eero Tamminen <eero.t.tamminen at intel.com> ---
(In reply to Alejandro PiƱeiro (freenode IRC: apinheiro) from comment #4)
> (In reply to zhoujian from comment #0)
> > FYI: In an unrelated test it was noticed that with DRI3, X still does
> > occasionally Vsync wait although test had zeroed swap interval.
...
> If Vsync were happening with fullscreen, the FPS (that is the measure of
> performance in this test) would be equal to the refresh rate. So for
> example, in my case 60FPS.

Only if it happens for every frame.  Year ago, when Vsync was disabled with
*DRI3*, I was seeing some tests being synched to 120 or 180 FPS i.e. every
second or third frame.


> But that is not the case, but ~360 FPS.
>
> curious thing is that it doesn't matter the resolution, on fullscreen the
> FPS are always 360FPS.

This is multiple of 60FPS, and it not changing sounds like some of the frames
were still synched.  I would suggest checking frame timings for individual
frames to see whether this is the case.


> But on windowed I detected ~380 for 1920x1280, ~860
> for 1280x720 and so on.

I haven't seen DRI3 sync-when-vsync-disabled issue in Windowed tests.

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