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: [EMAIL PROTECTED] web: www.sangoma.com Tel: 905-474-1990 x 106 800-388-2475 x 106 FAX: 905-474-9223
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] 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: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] 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 PCIbus 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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