[EMAIL PROTECTED] wrote:
I'm still confused. Is Paul handling (media and all, not just SIP referring) 5000 calls on Asterisk? If so, on *any* kind of hardware, that's impressive. If not, it's not impressive at all, on any kind of hardware.
It's not clear to me at all; some of us "Digium geeks" discussed this at VON and a few times since then, and I have not yet seen any detailed report of the test methodology. Paul's response from earlier in this thread implies they did have media transfer, but people have told me that SIPP does not do media at all, and their published 'report' says they used SIPP.
I would love to see the test methodology and actual measured numbers reported, both so we can learn just how good their system may be, and also so others can run the equivalent test on different platforms to learn just what is important in handling call volume. For example, I did not mention the clock speed difference between the two platforms they tested, because everyone knows that CPU clock speed is one the less important factors here, behind memory bandwidth, I/O bandwidth and interrupt response latency (also, their Itanium 2 box has only a 400MHz FSB, but since it is 64 bits wide I figure that's comparably to a P4's 800MHz FSB).
Paul's comments about the 6.4GB/s bus also intrigue me: my understanding of the Altix platform is that this high-speed bus is used for node-to-node interconnect, not internally within the nodes. If that is true, then testing on a single 2-CPU 'brick' doesn't bring the high-speed bus into the picture at all. The same would be true if someone ran a test on a single-node Cray XD1; sure they have an insanely fast interconnect bus (Myrinet, or something similar), but it's not used unless you are running multiple nodes.
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