Paul Mahler wrote:
By our calculations, 5000 SIP channels = 10000 ulaw stream @ 80k stream = .8
gigabit. Our total available bus bandwidth is arount 56 Gbps, as compared to
the pc with about 128 Mbps. We can add a bunch of NICs, so blowing past 1Gb
isn't really a problem.
That is incorrect. A standard PC PCI bus (old-style) does 132 megaBYTES per second (33 MHz x 32 bit transfer). Any modern server-class PC supports PCI-X, and can easily quadruple that, without even taking into considering multiple peer PCI busses.
Anyway, whatever it is we are testing, we get over 5000 of them before the MOS
starts to degrade. This is compared to 300 of them on a PC based machine with
comparable hardware before call quality degrades.
The test results you have published to date did not use "comparable hardware". You compared a box with 2 64-bit CPUs with 4MB of cache each against 2 32-bit CPUs with 512KB of cache each. Like all press releases and statistics, the results will be based on what you chose to compare :-) I suspect that a comparison against a dual Opteron box would prove very interesting to those looking for a 5,000 call solution...
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