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Could someone please explain these results? Is primusrun too smart for glxspheres and simply not doing extra work?

...:~$ glxspheres
Polygons in scene: 62464
Visual ID of window: 0xaf
Context is Direct
OpenGL Renderer: Mesa DRI Intel(R) Ivybridge Mobile 
59.811274 frames/sec - 66.749382 Mpixels/sec
59.577921 frames/sec - 66.488960 Mpixels/sec
59.791245 frames/sec - 66.727029 Mpixels/sec
59.723333 frames/sec - 66.651240 Mpixels/sec
...:~$ optirun glxspheres
Polygons in scene: 62464
Visual ID of window: 0x21
Context is Direct
OpenGL Renderer: Quadro K1000M/PCIe/SSE2
190.833067 frames/sec - 212.969703 Mpixels/sec
209.895160 frames/sec - 234.242999 Mpixels/sec
207.980413 frames/sec - 232.106141 Mpixels/sec
...:~$ primusrun glxspheres
Polygons in scene: 62464
Visual ID of window: 0xaf
Context is Direct
OpenGL Renderer: Quadro K1000M/PCIe/SSE2
61.001631 frames/sec - 68.077820 Mpixels/sec
59.677170 frames/sec - 66.599722 Mpixels/sec
59.715808 frames/sec - 66.642842 Mpixels/sec

Ubuntu 12.04 x64, Lenovo W530 w/ Intel i7 @ 2.8 GHz

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1 Answer 1

up vote 5 down vote accepted

From Primus FAQ:

Q: Performance does not exceed 60 fps, I was getting more with optirun/VirtualGL.
A: This is the effect of vblank synchronisation. For benchmarking, you can use 
   vblank_mode=0 primusrun ..., but in practice this will probably only 
   waste power, as your LCD panel does not display more than 60 frames 
   per second anyway.
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Wow... I swear I spent at least 20 minutes googling for this... sorry, this was obvious. Should I remove the question? –  VF1 Jul 17 '13 at 16:19
1  
Unless there is other question/answer stating this I think it should be better to let it stay, as it may help others with the same doubt. I only discovered this a week after I started using primus... –  Salem Jul 17 '13 at 16:41
    
OK. BTW, using vblank_mode=0 makes it A LOT faster. –  VF1 Jul 17 '13 at 16:48

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