[mythtv-users] BTTV errors

[Brian Foddy]

On Wednesday 04 February 2004 03:11 pm, Tom Walsh wrote:
> steve at nexusuk.org wrote:
> >I posted this a while ago and didn't get many reples, so I'll try again
> >and see if anyone has any ideas. :)
> >
> >I'm running Linux 2.4.24 with the ck1 patch (preempt / lowlatency) and
> >BTTV 0.9.12.  I keep getting errors like:
> >
> >Feb  3 12:00:04 myth kernel: bttv0: SCERR @ 0d8a7014,bits: HSYNC OFLOW
> >SCERR*
> >Feb  3 14:40:04 myth kernel: bttv0: SCERR @ 0d8a7014,bits: HSYNC OFLOW
> >SCERR*
> >

I believe you will find these are indicative of a busy pci
bus.  I had 2 such cards on my machine, along with a ivtv
and scsi card.  Used to get these errors often anytime both
cards were fired up along with the other devices.
When I start calculating, at 640x480 one bt card will
put 27MB/sec (640x480x3x30) on the pci bus, not counting the 
sound or HD activity.  Combine this with another heavy device
or 2, and pci bus saturation becomes a very real possibility
(133MB/sec max).

Brian