[Bug 39202] FPS - KDE desktop effects with 3.0 rc6 kernel

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Thu Aug 18 04:09:57 PDT 2011


--- Comment #28 from Siganderson <dj_def at webmail.it> 2011-08-18 04:09:57 PDT ---
I just booted a 2.6.38 kernel before that commit with these results:

cat /var/log/Xorg.0.log | grep Pageflipping
[    12.197] (II) RADEON(0): KMS Pageflipping: disabled
cat /var/log/Xorg.0.log | grep SwapBuffers
[    12.197] (II) RADEON(0): SwapBuffers wait for vsync: disabled

vsync in kde desktop effetcts settings is unticked (disabled)

Running synchronized to the vertical refresh.  The framerate should be
approximately the same as the monitor refresh rate.
9872 frames in 5.0 seconds = 1974.097 FPS
10436 frames in 5.0 seconds = 2087.059 FPS

vblank_mode=0 glxgears
ATTENTION: default value of option vblank_mode overridden by environment.
ATTENTION: default value of option vblank_mode overridden by environment.
10005 frames in 5.0 seconds = 1999.635 FPS
10654 frames in 5.0 seconds = 2130.778 FPS

the max fps is 60!!!
but if I enable vsync in kde desktop effects settings or doing "vblank_mode=1
kwin --replace" the fps goes to 100!!!
In these conditions vblank_mode=0 glxgears and vblank_mode=1 glxgears have the
same output (2000 FPS).
This has no sense.

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