[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]

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

Alejandro Piñeiro (freenode IRC: apinheiro) <apinheiro at igalia.com> changed:

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                 CC|                            |apinheiro at igalia.com

--- Comment #6 from Alejandro Piñeiro (freenode IRC: apinheiro) <apinheiro at igalia.com> ---
(In reply to Eero Tamminen from comment #5)
> (In reply to Alejandro Piñeiro (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.

Ok. In any case setting LIBGL_DEBUG to verbose I got this:
libGL: Using DRI2 for screen 0

So, as I mentioned this is also happening on DRI2.

> > 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.

Doing more tests: my previous numbers were on a gnome-session with metacity. On
a gnome-session with gnome-shell, or without compositor (ctrl+alt+fX, xinit) I
get similar outcome for windowed (slightly better) but tied to a little more of
790fps for the fullscreen case in any resolution.

> 
> > 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.

Ok.

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