vblank_mode=0 glxgears
ATTENTION: default value of option vblank_mode overridden by environment.
3315 frames in 5.0 seconds = 662.884 FPS
3624 frames in 5.0 seconds = 724.507 FPS
3752 frames in 5.0 seconds = 750.389 FPS
3869 frames in 5.0 seconds = 773.578 FPS