[Bug 74335] [UVD] vdpau has terrible performance on radeonsi (HD 7950) - bugzilla-daemon

From: bugzilla-daemon@freedesktop.org
To: dri-devel@lists.freedesktop.org
Subject: [Bug 74335] [UVD] vdpau has terrible performance on radeonsi (HD 7950)
Date: Fri, 21 Feb 2014 15:21:21 +0000	[thread overview]
Message-ID: <bug-74335-502-pU4b6eptTx@http.bugs.freedesktop.org/> (raw)
In-Reply-To: <bug-74335-502@http.bugs.freedesktop.org/>

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https://bugs.freedesktop.org/show_bug.cgi?id=74335

--- Comment #3 from darkbasic <darkbasic@linuxsystems.it> ---
I switched from libav/mplayer2 to ffmpeg/mplayer git and the crash seems gone.
Bye bye libav.

Being stable I did some more tests and unfortunately performance sucks so I
renamed the bug report.

Benchmarking the video output: ffh264 software decoder + gl/xv/vdpau

~ $ mplayer -benchmark -nosound -lavdopts threads=16 PlanetEarthBirds.mkv -vo
gl

BENCHMARKs: VC:   3.403s VO:   7.530s A:   0.000s Sys:   0.672s =   11.605s
BENCHMARK%: VC: 29.3238% VO: 64.8892% A:  0.0000% Sys:  5.7870% = 100.0000%

~ $ mplayer -benchmark -nosound -lavdopts threads=16 PlanetEarthBirds.mkv -vo
xv

BENCHMARKs: VC:   7.878s VO:   2.162s A:   0.000s Sys:   1.040s =   11.080s
BENCHMARK%: VC: 71.0951% VO: 19.5154% A:  0.0000% Sys:  9.3896% = 100.0000%

~ $ mplayer -benchmark -nosound -lavdopts threads=16 PlanetEarthBirds.mkv -vo
vdpau

BENCHMARKs: VC:   0.863s VO:  43.888s A:   0.000s Sys:   0.550s =   45.300s
BENCHMARK%: VC:  1.9042% VO: 96.8823% A:  0.0000% Sys:  1.2135% = 100.0000%

With both -vo gl and -vo xv it took ~11.080s while with -vo vdpau it took
45.300s. -vo vdpau is *4x* slower.

Benchmarking the video decoder: ffh264/ffh264vdpau + vo null

~ $ mplayer -benchmark -nosound -lavdopts threads=16 PlanetEarthBirds.mkv -vo
null

BENCHMARKs: VC:   8.855s VO:   0.002s A:   0.000s Sys:   0.493s =    9.350s
BENCHMARK%: VC: 94.7024% VO:  0.0262% A:  0.0000% Sys:  5.2714% = 100.0000%

~ $ mplayer -benchmark -nosound PlanetEarthBirds.mkv -vo null -vc ffh264vdpau

It seems I can't use the null video output with the hardware decoder
ffh264vdpau: I get tons of  "Too many buffered pts". It does support only -vo
vdpau, not even xv or gl. Such a pity. (is it a known limitation/bug?)

Let's do a more complete benchmark: ffh264+xv vs ffh264vdpau+vdpau

We already saw ffh264+xv took 11.080s, let's see how ffh264vdpau+vdpau
performs.

~ $ mplayer -benchmark -nosound PlanetEarthBirds.mkv -vo vdpau -vc ffh264vdpau

BENCHMARKs: VC:   0.869s VO:  44.581s A:   0.000s Sys:   0.374s =   45.824s
BENCHMARK%: VC:  1.8955% VO: 97.2876% A:  0.0000% Sys:  0.8169% = 100.0000%

As expected it's still 4 times slower because the bottleneck is obviously the
vdpau video output and not the ffh264vdpau decoder.

Being 4x slower vdpau is completely useless right now :(
Please note that I disabled desktop compositing before doing the tests.

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