https://bugs.freedesktop.org/show_bug.cgi?id=38800 --- Comment #38 from Mario Kleiner <mario.kleiner@xxxxxxxxxxxxxxxx> 2011-07-07 14:51:16 PDT --- (In reply to comment #37) > Maybe we should try and sort out why there is so much latency in the interrupt > handler for Simon rather than rewriting the entire thing. Or we could just use > the pflip interrupts where they are working and use the existing code on older > asics. Yes. I think that delay needs to be sorted out anyway - it would also kill dynamic clock switching which needs to happen within vblank afaik and any kind of realtime performance, e.g., with preempt_rt kernels, if not fixed. Then the immediate problem of Simon would go away. iirc correctly, the numbers should be closer to 10-30 usecs, instead of close to 400 usecs, tested on Core2Duo 2.2 Ghz rv530, and ancient Athlon 1.2 Ghz with r600. But the proposed new design could make sense for a future pageflip ioctl v2 implementation to add robustness and some headroom for things like synchronized swaps across crtc's, swap groups, frame-sequential stereo, or lower latency flips. I will probably toy around with this in my spare time if we choose not to rewrite the entire thing now - which i would sort of prefer, given that the current implementation is tested to be pretty reliable on r500+ and i have actual users now starting to use/rely on the radeon timestamping being precise and reliable. -- 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
