An interesting results.
DRI2:
$ vblank_mode=0 glxgears
ATTENTION: default value of option vblank_mode overridden by environment.
6321 frames in 5.0 seconds = 1264.103 FPS
6380 frames in 5.0 seconds = 1275.943 FPS
6369 frames in 5.0 seconds = 1273.629 FPS
6377 frames in 5.0 seconds = 1275.322 FPS
6387 frames in 5.0 seconds = 1277.330 FPS
6407 frames in 5.0 seconds = 1281.337 FPS
6381 frames in 5.0 seconds = 1276.053 FPS
6410 frames in 5.0 seconds = 1281.855 FPS
6405 frames in 5.0 seconds = 1280.905 FPS
6378 frames in 5.0 seconds = 1275.599 FPS
^C
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
DRI3:
$ cat /etc/X11/xorg.conf.d/nouveau-dri3.conf
Section "Device"
Identifier "Videocard0"
Driver "nouveau"
Option "DRI" "3"
EndSection
$ grep DRI3 /var/log/Xorg.0.log
[ 4367.417] (II) NOUVEAU(0): DRI3 on EXA enabled
$ vblank_mode=0 glxgears
ATTENTION: default value of option vblank_mode overridden by environment.
7276 frames in 5.0 seconds = 1455.099 FPS
7353 frames in 5.0 seconds = 1470.475 FPS
7373 frames in 5.0 seconds = 1474.566 FPS
7377 frames in 5.0 seconds = 1475.310 FPS
7355 frames in 5.0 seconds = 1470.943 FPS
7350 frames in 5.0 seconds = 1469.864 FPS
7370 frames in 5.0 seconds = 1473.970 FPS
7360 frames in 5.0 seconds = 1471.911 FPS
7360 frames in 5.0 seconds = 1471.944 FPS
7365 frames in 5.0 seconds = 1472.809 FPS
^C
SW:
xorg-x11-drv-nouveau-1.0.12-0.3.fc22.x86_64
xorg-x11-server-Xorg-1.17.2-2.fc22.2.x86_64
mesa-dri-drivers-10.6.9-1.20151008.fc22.x86_64
libdrm-2.4.61-3.fc22.x86_64
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