[Bug 71448] [UVD] qvdpautest is very slow on radeonsi (HD 7950)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71448

--- Comment #10 from Vadim Girlin <ptpzz at yandex.ru> ---
This is probably related to dpm and gpu clocks - if I run "vblank_mode=0
glxgears" in parallel with the benchmark the results are significantly better
for me:

w/o gears:

MPEG DECODING (1920x1080): 13 frames/s
MPEG DECODING (1280x720): 13 frames/s
H264 DECODING (1920x1080): 12 frames/s
H264 DECODING (1280x720): 13 frames/s

with gears:

MPEG DECODING (1920x1080): 77 frames/s
MPEG DECODING (1280x720): 118 frames/s
H264 DECODING (1920x1080): 51 frames/s
H264 DECODING (1280x720): 92 frames/s 

(In reply to comment #6)
> *Anyway* when I did run the attached benchmark I forced dpm to "high" before
> starting.

Setting power_dpm_force_performance_level to "high" doesn't really work for me
in this case - AFAICS the driver resets it back to "auto" when the benchmark
starts, probably when switching to uvd state.

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