[Asterisk-Users] Cannot get two TE410Ps to operate correctly in the same machine

["Dr. Fernando Macías Garza"]

You were right. It was a PCI latency issue. I played with this thing for 
hours until I realized that I got no IRQ misses on the second card until 
my agents logged into the system using IAX. As soon as the first one 
logged in, IRQ misses started.

I played with the latency on the Digium cards, but that didn't work. 
Then, I reduced the latency timer of the two network boards on the 
system to 0, and that took care of the problem. I've been running for 
several hours without a glitch.

setpci -v -s XX:X.X latency_timer=00

Some things that I still don't understand:
* Why the second card will always say it is internally clocked, although 
it has a telco line connected to it and span 1 in that card is 
configured as a sync source.
* What the purpose of the rotary switch on the TE410 board is.
* The zaptel configuration for multiple boards seems sketchy. I 
currently have the spans for the second card numbered 5-8 in 
zaptel.conf, but if I number them 1-4 the system works too, even though 
the spans for the first card are numbered the same.
* Finally, I don't understand why the IAX traffic affects the 
performance of the second card only.

Thanks

Fernando

Rich Adamson wrote:

>>Problems
>>========
>>
>>- Choppy voice on calls between channels of card 1.
>>- Even worse on calls between card 0 and card 1.
>>- Card 0 behaves well.
>>- IRQ misses for card 1. Have tried different interrupts. Same thing.
>>- HDLC overrun messages on console for card 1.
>>    
>>
>
>Almost sounds like the classic interrupt latency / pci controller issue
>where there's not enough processor time left to adequately handle the
>second card. (Obviously that's a pure guess though.)
>
>  
>
>>Strange fact, may be the cause of the problem
>>=============================================
>>
>>Configuration for first span on card 1 is:
>>
>>span=5,1,0,ccs,hdb3
>>bchan=118-132
>>dchan=133
>>bchan=134-148
>>
>>However, zttool reports card as "Internally Clocked". No matter how I've 
>>tried, I cannot get card 1 to clock from the external source:
>>Sync Source:        Internally clocked
>>
>>First span on card 0 is configured just the same:
>>
>>span=1,1,0,ccs,hdb3
>>bchan=1-15
>>dchan=16
>>bchan=17-31
>>
>>This card gets clocked OK:
>>Sync Source:        TE410P (PCI) Card 0 Span 1
>>    
>>
>
>Realistically, there should only be a single external span interface 
>on your system that is used for sync source. I'm not a programmer so 
>can't verify the code might have limits built in to ensure that.
>
>
>
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