Following up myself. We have tested master + qt 5.3.2 and master + qt 5.4.1 combinations, with LVDS 1280x800 screen and eglfs backend.
Overall results are: dizzy, qt 5.3.2, imx6s => 22 fps [this is poor hw, included just for reference] dizzy, qt 5.3.2, imx6q => 37 fps master, qt 5.3.2, imx6q => 49 fps master, qt 5.4.1, imx6q => 59 fps Thus "memory bandwidth" is *not* the limiting factor on original setup. Pure software update resulted into significant fps improvement. Many thanks to Heikki Sarkanen for information that master branch shows better graphics performance. > 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 > -- _______________________________________________ meta-freescale mailing list meta-freescale@yoctoproject.org https://lists.yoctoproject.org/listinfo/meta-freescale