[Devel] OpenSER/SER with OSP performance test results

[Di-Shi Sun]

Hi All,

We have performed a benchmark test on OpenSER V1.1, V1.2 and SER 2.0 to understand and compare the performance of the three releases in a simulated production environment.  
 
Test Setup:
===========
1.  SIPp was used to generate the call load.

2.  SIP calls were directed to the SIP proxy hosted on a server with two, dual core, Intel Xeon 5140 2.33 GHz CPUs.  To limit the need for call generation resources, we disabled three of the CPU cores.  These tests were run on a single core of one CPU.

3. The SIP proxy being tested was configured to query an external OSP server for routing information on each call.

4. Five destinations are returned to OpenSER for each call in random order. Four of the five destinations simulated call failure scenarios so OpenSER had to retry the call an average of two times before the call was completed.

5. The SIP proxy reported call detail records to an external OSP server.
 
Summary of the test results:
============================
* The performance of OpenSER V1.2 and SER 2.0 are not materially different, however, there are two minor differences. 
  - SER V2.0 requires less memory. 
  - OpenSER V1.2 has less post dial delay. 

* By all measures, OpenSER V1.2 is significantly better than OpenSER V1.1. 

* For production operation (with call retries and CDR reporting), we suggest the following simple guideline for sizing server hardware for OpenSER V1.2 and SER V2.0: 

One GHz of CPU processing capacity can manage 60 calls per second at 60% CPU utilization.

For example, a server with two, dual core, 3.0 GHz CPUs would effectively have (2 CPUs * 2 cores * 3 GHz per CPU) twelve GHz of CPU processing capacity.  This server, hosting either OpenSER V1.2 or SER 2.0, would be able to manage 720 calls per second with approximately 60% CPU utilization. 

The test plan and raw data are available at
http://www.transnexus.com/White%20Papers/OpenSER-SER_Comparison.htm

Regards,

Di-Shi Sun.
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