Goal: To measure the media thruput performance of the symmitron which
is the core performance sensitive component of sipxbridge.
Description
Experiments were performed with 100 bidrectional streams pushing data through
the symmitron. I allocated 50 bridges in the symmitron. This would
correspond to 50 concurrent phone calls with bidrectional media which
is our desired operating point.
Each bridge had a pair of Syms Each sym received data from a sender
and forwarded it to the other side.
Measurements were made over 1000 packets. I performed the experiments
on my laptop ( dual core 2 ghz intel processor ).
The symmitron ran in the same process as the sender and receiver.
sender ---->| |---> receiver
| bridge |
receiver<----| |<--- sender
Measurements
------------
Time between packets Root Mean Square Jitter value (measured at receiver)
10 ms. PACKET LOSS occured.
20 ms. 6.17 ms. ( 0 packet loss )
40 ms. 1.9 ms. ( 0 packet loss )
80 ms. 1.15 ms. ( 0 packet loss )
160 ms. 1.10 ms. ( 0 packet loss )
Conclusion
---------
The bridge can easily perform at the desired design point of 50 concurrent
calls.
I do not foresee any performance issue with SIP signaling either. On
an unloaded machine, the stack performs at 100 CAPS for dialog
stateful operation.
--
M. Ranganathan
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