[mythtv-users] Problems with multiple pvr cards

[Russ W. Knize]

The driver.  In /etc/modules:

ivtv enc_mpg_buffers=24 enc_vbi_buffers=8

Russ

On Thu, 2007-05-10 at 06:24 -0400, Brian L. Walter wrote:
> Russ W. Knize wrote:
> > I've been having many issues with DMAs lately.  I changed a lot of
> > things at once and have rolled back the hardware and I still get them.
> > Part of the issue is with ivtv.  There is a bug in 0.10.1 where the
> > interrupt handler does some slow PIO to retrieve VBI data.  This ties-up
> > the system preventing it from handling other DMAs.  With a PVR-500, two
> > NICs, a RAID-5 SATA card, and a PATA card, I was getting DMA errors with
> > just one encoder going.  If both encoders go, the system is brought to
> > it's knees and will either die or the encoder hardware will lockup.  
> >
> > Turning off VBI capture in Myth does not seem to stop ivtv from reading
> > the data.  I modified the driver to turn off this feature which helped,
> > but was not a total solution.  Tuning the PCI latency settings and
> > increasing the encoder buffer sizes also helped, but I still get
> > occasional issues.
> >
> > Next I am going to try the 0.10.2 SVN branch.  Downgrading is
> > problematic, as I will have to downgrade my kernel as well.
> >
> > Good luck,
> > Russ
> >
> > On Wed, 2007-05-09 at 17:14 -0700, David Rees wrote:
> >   
> >> On 5/8/07, Brian L. Walter <blwalter at gmail.com> wrote:
> >>     
> >>> However, when Myth goes to record on all 3, I start getting ENC DMA
> >>> Errors, anywhere from  immediately to 20-30 minutes.
> >>>
> >>> I've read that there is an interrupt issue with the 0.10.1, and was
> >>> wondering if this is a result of that issue.
> >>>       
> >> FWIW, the latest code in the ivtv 0.10 branch appears to be more
> >> stable for me than 0.10.1. Not quite sure why, but you may want to
> >> give it a shot.
> >>
> >> -Dave
> >>     
> Dave,
> 
> Misery loves company:)  At least some one else is seeing the same type 
> of issue.
> 
> I guess one thing I'm going to have to do is call Asus, as I can't find 
> a way to modify the latency on my motherboard.  I use setpci, but, the 
> value doesn't 'take'.  And when I emailed them, I got a 'This is too 
> hard to respond to in mail, call us'' response...*sigh*.
> 
> I hadn't realized 0.10.2 was in svn.  The last time I tried, I believed 
> it was still 0.10.1.
> 
> When you modified the the encoder buffer size, was that in the driver, 
> or in myth?
> 
> TIA
> Brian
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