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Old 03-10-09, 06:02 PM   #1
motd2k
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Default vdp_presentation_queue_display blocking

Is there any reason why this function would be blocking and pegging the processor? It seems to happen infrequently after preemption.

PHP Code:
(gdb) bt
#0  0xb7f19430 in __kernel_vsyscall ()
#1  0xb74671ec in sched_yield () from /lib/tls/i686/cmov/libc.so.6
#2  0xaf2bb467 in ?? () from /usr/lib/libvdpau_nvidia.so
#3  0xaf2ec50b in ?? () from /usr/lib/libvdpau_nvidia.so
#4  0xaf2bb5b9 in ?? () from /usr/lib/libvdpau_nvidia.so
#5  0xaf2bad0a in ?? () from /usr/lib/libvdpau_nvidia.so
#6  0xaf2bad88 in ?? () from /usr/lib/libvdpau_nvidia.so
#7  0xaf2a4c36 in ?? () from /usr/lib/libvdpau_nvidia.so
#8  0xaf2a5488 in ?? () from /usr/lib/libvdpau_nvidia.so
#9  0xaf2b076f in ?? () from /usr/lib/libvdpau_nvidia.so
#10 0xaf2b3290 in ?? () from /usr/lib/libvdpau_nvidia.so
#11 0xaf2a99df in ?? () from /usr/lib/libvdpau_nvidia.so
#12 0xb18d1c3d in ?? () from /usr/lib/libvdpau_trace.so
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Old 03-10-09, 06:20 PM   #2
Stephen Warren
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Default Re: vdp_presentation_queue_display blocking

That function certainly can busy-wait under a few atypical conditions. Can you tell me which driver version the backtrace came from? Thanks.
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Old 03-10-09, 06:23 PM   #3
motd2k
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Default Re: vdp_presentation_queue_display blocking

Stephen,

That's from 180.37.
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Old 03-10-09, 06:42 PM   #4
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Default Re: vdp_presentation_queue_display blocking

I have decoded the backtrace. I need some more information to fully investigate this:

a) Can you run MPlayer with VDPAU_NVIDIA_DEBUG=3, reproduce the problem, and send the information that prints.

b) What GPU do you have, or can you provide an nvidia-bug-report.

c) Can you upload a sample clip that causes preemption for you.

Hopefully I can reproduce the issue and debug it interactively...

Thanks.
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