Hi,
Just to review the test I did:
----------- SIP extension ------------------ Trunk
-----------------
| SIPp |<----------------------->| Asterisk 1 |<---------------->|
Asterisk 2 |
----------- -------------------
------------------
Both Asterisk boxes are virtual machines in VirtualBox and version
1.4.21.2. I generated calls using SIPp, and I monitored the cpu
utilization in the Asterisk 1 with top. I compare the cpu utilization
when I used IAX and when I used SIP as Trunk protocol. The following
are the results (averages) I got with ulaw codecs in both sides:
Calls IAX SIP
4 6,0 1,8
10 9,2 4,6
20 19,5 8,6
30 28,2 13,5
34 36,9 16,2
40 38,2 19,5
50 36,9 24,3
As you can see, IAX almost doubles the cpu cycles. I repeated the test
using gsm as the trunk codec, and in this scenario IAX shows a better
performance (Sip extension continues with ulaw):
IAX SIP
1,8 25,7
12,8 41,5
29,2 47,0
45,7 69,4
54,2 78,5
53,3 83,3
65,7 87,1
And finally I repeated with iLBC in the trunk, and SIP won again:
IAX SIP
8,5 9,4
29,3 14,5
57,6 23,6
74,4 37,3
84,3 41,5
-- 51,2
-- 67,0
Does this makes sense? Any feedback? Has anybody done similar test for
comparison?
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