Disable vertical sync for glxgears

linux 3d glx
mschmoock picture mschmoock · Jun 19, 2013 · Viewed 117k times · Source

Sometimes you need to check whether you Linux 3D acceleration is really working (besides the glxinfo output). This can be quickly done by the glxgears tool. However, the FPS are often limited to the displays vertical refresh rate (i.e. 60 fps). So the tool becomes more or less useless since even a software render can produce 60FPS glxgears easily on modern CPUs.

I found it rather hard to get a quick and easy solution for this, I answer my own question. Hopefully it saves your time.

Answer

mschmoock picture mschmoock · Jun 19, 2013

The vblank_mode environment variable does the trick. You should then get several hundreds FPS on modern hardware. And you are now able to compare the results with others.

$>   vblank_mode=0 glxgears

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