[mythtv-users] Problems with multiple pvr cards

[Brian L. Walter]

Yan-Fa Li wrote:
> On 5/8/07, Brian L. Walter <blwalter at gmail.com> wrote:
>   
>> Greetings,
>>
>>     
>
> Hey,
>
>   
>> I've got 1 pvr-500 and one pvr-150, running ivtv 0.10.1 with myth
>> 0.20-fixes as of 5/6.
>>
>> I have run a couple 30 minute cat /dev/videoN against all 3 devices
>> simultaneously, with no problem.
>>
>> However, when Myth goes to record on all 3, I start getting ENC DMA
>> Errors, anywhere from  immediately to 20-30 minutes.
>>
>>     
>
> Usually this is motherboard related.  I have a triple tuner set up
> with a PVR150, PVR250 and HD5500 and it runs without skipping a beat.
> What chipset is at the core of your motherboard?  VIA chipsets are
> particularly problematic.
>
> What distribution and kernel are you running?
>
>   
>> 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.
>>
>> This problem does not occur when only 2 of the three inputs are in use,
>> only with all three.  The only way to clear it up is to reboot, because
>> this situation will eventually lead to dma timeouts, and driver not
>> responding....then...system crash.
>>
>> I just want to make sure I'm not chasing my tail when this is all
>> related to the interrupt issue, if there *is* currently an issue...
>>
>>     
>
> If you can make sure the cards aren't sharing IRQs that's helpful.
> Known good motherboard chipsets are Intel, Nvidia and SIS.
>
> Good luck with debugging this.
>
> Yan
>   
Yan,

Thanks for the tips.  The tuners all have their own interrupt - the 
motherboard is Nvidia based (Asus M2N-SLI-Delux). 

Distribution is FC6 with kernel 2.6.20.

Brian