[meta-freescale] imx6q gpu performance lower than expected
Nikita Yushchenko
nyushchenko at dev.rtsoft.ru
Tue Mar 17 07:08:25 PDT 2015
Hi
I've built freescale community bsp dizzy for a custom imx6q based board,
and now I'm experimenting with GPU performance under Qt5.
I have both xcb and eglfs backends running (under different builds).
However performance is lower than was expected: on LVDS 1280x800,
Qt5_CinematicExperience shows about 35-37 FPS, both under X11 and under
eglfs. If using smaller window under X11, FPS increases, if using
1920x1080 it goes down to 20.
This is much smaller than people get [1].
[1] https://community.freescale.com/thread/305066
CPU in both cases (x11 and egl) is almost unloaded (30% of one core
under eglfs, 30+30 under X11) so looks like speed limiting comes from GPU.
What could be reason for this? Any hints?
TIA,
Nikita Yushchenko
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