On Mon, 15 Feb 2010 06:47:35 -0600 DRC <[email protected]> wrote:
> Try running glreadtest (it's in the VirtualGL source tree but isn't > installed) on display :0 and see what the readback performance looks > like. That's the most likely cause of glXSwapBuffers() being slow. > I've seen that problem with ATI hardware/drivers before, but it was a > while ago on a mobile Radeon device. My FirePro v5700 screams, but of > course I haven't tried it with the upgraded driver yet. > I managed to get the old 9.9 driver running again, which seems to get my system back to a fully running state. It also allows for some comparison: 9.9 OpenGL version string: 2.1.8918 >>>>>>>>>> PIXEL FORMAT: BGRA <<<<<<<<<< glDrawPixels(): 250.903898 Mpixels/sec glReadPixels() [bottom-up]: 44.335403 Mpixels/sec glReadPixels() [top-down]: 3.233689 Mpixels/sec 9.12 OpenGL version string: 3.2.9232 >>>>>>>>>> PIXEL FORMAT: BGRA <<<<<<<<<< glDrawPixels(): 492.440445 Mpixels/sec glReadPixels() [bottom-up]: 44.233969 Mpixels/sec glReadPixels() [top-down]: 1.951933 Mpixels/sec The values are slightly different for the other formats, but the trend is the same. > I wonder also whether it might be a driver permission issue. If DRI > isn't enabled, the symptom can be slow readback, but VirtualGL should > also complain that an Indirect GLX context was obtained on the 3D X Server. > No such issues, and /dev/ati/card0 has 0666. > At any rate, if glreadtest is also slow, then that will give you an easy > way to reproduce the problem for ATI/AMD support. > Got any good tips for ways of getting their attention? Rgds -- Pierre Ossman OpenSource-based Thin Client Technology System Developer Telephone: +46-13-21 46 00 Cendio AB Web: http://www.cendio.com
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