[Asterisk-biz] Large Asterisk Setup (~500 Concurrent Calls+Scalability)

[Matt Roth]

David,

This runs contrary to the advice that was given to us by a Digium 
representative, even when we asked about using Intel Dialogic quad-span 
cards.

Do Sangoma cards do any on-board processing to decrease PCI bus traffic, 
such as DSP and codec transcoding?

I am learning as I go and would appreciate it if you could share any 
information regarding the PCI bus traffic generated by quad-span cards.  
What are the sources, and how much traffic do they generate per channel?

In your opinion, why did the Digium representative advise against more 
than two quad-span cards per machine?  Could the bottleneck actually be 
induced by CPU interrupts?

Thank you,

Matthew Roth
http://www.voip-info.org/tiki-index.php?page=Running%20Asterisk%20on%20Debian

David Mandelstam wrote:

>Hi Bill,
>
>Of course no one is. But there is utterly no problem running multiple quad
>port boards on a PCI bus. The standard PCI has a throughput of
>132Mbytes/sec, and each quad board has a total load of 2.1Mbytes/sec max
>with full E1. So you can throw quite a lot of boards into a PC before you
>start getting close to PCI limits. We have operational customers using 4
>quads per machine, and I have no reason to suppose that is the maximum.
>
>Regards,
>
>David Mandelstam
>Sangoma Technologies Corporation
>email:     dm at sangoma.com
>web:       www.sangoma.com
>Tel:       905-474-1990 x 106
>           800-388-2475 x 106
>FAX:       905-474-9223
>
> 
>
>  
>
>>From: asterisk-biz-bounces at lists.digium.com 
>>[mailto:asterisk-biz-bounces at lists.digium.com] On Behalf Of 
>>William Boehlke
>>Sent: Thursday, April 21, 2005 1:21 PM
>>To: 'Commercial and Business-Oriented Asterisk Discussion'
>>Subject: RE: [Asterisk-biz] Large Asterisk Setup (~500 
>>Concurrent Calls+Scalability)
>>
>>
>>Who is building motherboards with a dedicated bus for each PCI slot?
>> 
>>
>>-----Original Message-----
>>From: asterisk-biz-bounces at lists.digium.com
>>[mailto:asterisk-biz-bounces at lists.digium.com] On Behalf Of Brian West
>>Sent: Wednesday, April 20, 2005 3:37 PM
>>To: Commercial and Business-Oriented Asterisk Discussion
>>Subject: Re: [Asterisk-biz] Large Asterisk Setup (~500 
>>Concurrent Calls
>>+Scalability)
>>
>>
>>On Apr 20, 2005, at 4:20 PM, Matt Roth wrote:
>>
>>    
>>
>>>Allow me to clarify that statement.  The traffic on the PCI 
>>>      
>>>
>>bus to the 
>>    
>>
>>>CPU is the bottleneck.  We have sent emails to Digium regarding 
>>>multiple quad-span cards in a single PC-class machine and they 
>>>recommended against it for this reason.
>>>
>>>      
>>>
>>Not if you get a good board with a dedicated bus per PCI slot.
>>
>>/b
>>
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