[mythtv-users] Problems with multiple pvr cards

[Brian Walter]

Russ W. Knize wrote:
> 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
>> _______________________________________________
>> mythtv-users mailing list
>> mythtv-users at mythtv.org
>>     
Forgive the ignorance:

I'm running FC6 - and have no file /etc/modules.  I know these kind of 
things vary from distro to distro, so, do I just create a 'modules' file 
there with the information, or, does FC store this somewhere else?

Brian