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Old 02-28-11, 06:32 PM   #14
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Join Date: Feb 2003
Location: St. Petersburg, Russia
Posts: 20
Default Re: GF100 VDPAU performance is really not good

I also have this problem. I have one machine with a 9600GT card, which plays video smooth and well (because it doesn't have any PowerMiser settings at all) and my home computer has a GT240, which has this "advanced" feature. I have observed that the performance is bad even on 720P videos, not speaking on full HD - sometimes (quite often) video will gets slower, then suddenly accelerates to let the video overtake the sound.

I ran the qvdpautest on both 9600GT and GT240, and, as expected, the numbers on GT240 are quite low (1.5-2 times slower on video decoding and 4-7 times slower on mixer algorithms), similar to the numbers in the first post. Also, the "Performance Level" in nvidia-settings always stays on 1 (never seen it even at 0), and never gets to 2, here's a screenshot.

I tried both "Adaptive" and "Prefer maximum performance" modes, and I don't see a difference between them - the driver stays on level 1, no matter what I do - nothing, play video or make love, for instance.

The results of qvdpautest:

nVidia Corporation GT215 [GeForce GT 240] (rev a2)

qvdpautest 0.5.1
Intel(R) Core(TM)2 CPU 6600 @ 2.40GHz
NVIDIA GPU GeForce GT 240 (GT215) at PCI:1:0:0 (GPU-0)

VDPAU API version : 1
VDPAU implementation : NVIDIA VDPAU Driver Shared Library 260.19.36 Tue Jan 18 17:14:46 PST 2011


MPEG DECODING (1920x1080): 53 frames/s
MPEG DECODING (1280x720): 121 frames/s
H264 DECODING (1920x1080): 45 frames/s
H264 DECODING (1280x720): 93 frames/s
VC1 DECODING (1440x1080): 61 frames/s
MPEG4 DECODING (1920x1080): 53 frames/s

MIXER WEAVE (1920x1080): 324 frames/s
MIXER BOB (1920x1080): 534 fields/s
MIXER TEMPORAL (1920x1080): 161 fields/s
MIXER TEMPORAL + IVTC (1920x1080): 100 fields/s
MIXER TEMPORAL + SKIP_CHROMA (1920x1080): 213 fields/s
MIXER TEMPORAL_SPATIAL (1920x1080): 104 fields/s
MIXER TEMPORAL_SPATIAL + IVTC (1920x1080): 73 fields/s
MIXER TEMPORAL_SPATIAL + SKIP_CHROMA (1920x1080): 124 fields/s
MIXER TEMPORAL_SPATIAL (720x576 video to 1920x1080 display): 287 fields/s
MIXER TEMPORAL_SPATIAL + HQSCALING (720x576 video to 1920x1080 display): 241 fields/s

MULTITHREADED MPEG DECODING (1920x1080): 43 frames/s
MULTITHREADED MIXER TEMPORAL (1920x1080): 115 fields/s
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