My experience is very limited, but you asked for any perspective, so...
I put an Asterisk with freePBX on a linode server (linode.com), just to play with it a few months ago. I can say that it worked to the point of being able to dial out with my Polycom phone on a FiOS connection, through the * box, and a SIP termination service like Vitelity, and to receive calls in the other direction. No problems with that, and kinda cool to be able to throw a virtual PBX out there with so little expense. I did not stress test it, nor did I examine resource usage to gain perspective on scalability. More of a proof of concept.
One issue that comes up with regard to this is about timing sources for MOH, etc. Related to this and of general use to know, I believe one can associate PCI cards with particular VMs, but it's been a few months since I configured a Xen box of my own, so the details have already fled from my feeble brain...
But I hope that's helpful. Alex Balashov wrote:
Does anyone have any perspective on how well Asterisk performs and scales inside a Xen hypervisor environment?
Obviously, the answer depends largely on what sort of hardware it's running on, whether it's in PAE mode, whether it's a newer CPU that has some paravirtualisation instruction sets available to assist it, how much memory is allocated to each VM, and other architectural considerations.
Any perspective would be helpful, however.
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