https://bugs.freedesktop.org/show_bug.cgi?id=38800 --- Comment #16 from Michel Dänzer <michel@xxxxxxxxxxx> 2011-07-05 10:37:21 PDT --- (In reply to comment #15) > Whatever resolution I choose, perf top shows me that 50% of my used CPU time is > spent in r600_fence_finish from the r600g DRI driver. That makes some sense, as r600_fence_finish() is currently more or less a polling loop. This CPU usage is probably glFinish() waiting for the frame to finish rendering. (BTW, IIRC the intel drivers used to have a broken glFinish() implementation which didn't always wait for all rendering to finish. I wonder if your tests might have been affected by that) > I also see about 5% of my used CPU time in radeon_fp_native_mode from the > kernel driver; again, this is resolution independent. Hmm, this might indicate it's constantly trying to get a native mode for the fake LVDS. Have you tried force-disabling it, to see if that makes any difference? > I'm forced to conclude that it's not CPU-side slowdown - is there any way (like > Intel's intel_gpu_top and intel_gpu_dump) to see roughly what the GPU is up to? Not yet, unfortunately. However, I think we first need to narrow down further where exactly the CPU is blocking, and why. -- Configure bugmail: https://bugs.freedesktop.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug. _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
