[ivtv-users] Perf issues with the ivtvfb driver

[ps1]

Hi,

New installation of a plain old Hauppauge PVR-350 card on a 'not too old 
system' : P4C 2,4Gb (that's an hyperthreaded processor I think I read 
things about that), 2 Gb RAM.
Linux Distro is Mandriva 2009, with the furnished kernel 2.6.27
The system has a GeForce 6600 GT video card,  with the nvidia 
proprietary driver. Hardware acceleration seems fine.
Without hte ivtvfb driver, if I send a previously recorded mpeg file on 
/dev/video16, everything is ok (without CPU use)
Starting the ivtvfb driver (with the following options, witch are good 
for my PAL TV, but the perf issues is the same without options ) :
options ivtvfb debug=3 osd_xres=720 osd_yres=576 osd_depth=32
I get a /dev/fb1 driver
If I try to play the same movie, like that :
mplayer  -vo fbdev:/dev/fb1  test.mpeg
My system run a 100 % CPU usage, and the video is rendered at aroound 5 fps
Doing the same on the fb0 device cause the system to render the movie at 
normal speed (25 fps) and with 30 % CPU usage.

I'm really puzzled, because this card was in use in my first HTPC, witch 
was running with an athlon XP processor underclocked at 600 Mhz and 
video were running smoothly. At this time, I wasn't able to configure 
the system in native directfb, so I used an X11 layer in between ! I 
think that this was with a 2.6.14 or 17 kernel, at this time I had to 
compile the drivers.

(I did also tests with the X11 layer, and this doesn't work better.)

I did google search, but didn't find anything like that, so I hope that 
this is just a configuration trouble.

BTW, I configured the xorg.conf file directly like the sample in the 
ivtv wiki, was very easy and helpful, thanks ! I just had to change the 
name of the driver from ivtv to fbdev

Last question, not really related ! Is it possible, with the ivtvfb 
driver loaded, to use the audio output of the card ?

Thanks,
Pascal