Hi Donald, On Mon, May 14, 2012 at 5:33 PM, Donald Carr <[email protected]> wrote: > Guten tag, > > I am seeing poor performance of scenegraph on a: > > 0f:00.0 VGA compatible controller: NVIDIA Corporation GT200GL [NVIDIA > Quadro FX 3800] (rev a1) > > using the 302.07 driver (Upgraded from 295 in trouble shooting this > issue). This is clearly using the XCB QPA backend, and does not appear > to manifest on other lower end GPU hardware I have access to. > > I am not using Mesa which is everyone's go to first guess. > > I am wondering: > > 1) if anyone else is witnessing this > 2) if people are seeing fantastic performance against the Nvidia > binary blob, which Nvidia card they are using. > > This is a simple example I am seeing this against: > > https://github.com/capisce/motionblur > > I am seeing around 2-3 fps with kwin composition enabled, around 30 > fps with kwin composition disabled. > CPU usage of the app is consistently around 4% of a single core > (according to top) > > It would interesting to gather a larger sample set of the afflicted hardware. >
On my HD 3000 (part of i3 2310M), I get 30fps without run.sh. With run.sh, I get 60fps. With both of them, many frames are missed and there is a clear frequent stutter in the animation of the globe. CPU usage is around 15-20%. resolution for both: 1366x768. When I decreased the window size to ~1200x700, no stuttering. The CPU usage is still around 15-20%. Also, I have seen the stutter in animation in many of the boards. I don't think it's a graphics issue, something wrong with our timer code possibly. Is anyone aware of some problem here? Girish _______________________________________________ Development mailing list [email protected] http://lists.qt-project.org/mailman/listinfo/development
