[SR-Users] Green VoIP - energy efficiency and performaces of v3.0

[Daniel-Constantin Mierla]

Hello,

Jan Janak conducted a very interesting research project regarding energy 
efficiency of VoIP systems during 2010, a collaboration between 
iptel.org and Columbia University.

The team used the source code from sip-router.org GIT repository from 
January 2010, which corresponds to Kamailio (former OpenSER) and SER 
v3.0. The latest stable series v3.1 shares the same internal 
architecture with v3.0.

As part of the research work, Jan could also gather some figures about 
capacity and performances of v3.0 with a quite complex configuration 
file: etc/sip-router-oob.cfg (involving authentication and NAT traversal 
as well).

You can read the paper about energy efficiency at:

- Green VoIP Article: http://asipto.com/u/2j

The draft notes about capacity and performances of v3.0 are available at:

- Performances and Capacity for v3.0 Wiki page: http://asipto.com/u/2k

Some interesting results:

- one instance of SIP server with 500 000 online users (mixed users – 
behind and not NAT routers) – consumed energy 210W
- one instance of SIP server with 1 000 000 online users (no NAT 
involved) – consumed energy 190W
- on a 32-bit machine with 4GB of memory and with 2.5GB reserved for SIP 
server, the server could support 43 000 simultaneous TLS connections – 
consumed energy 203W
- one SIP server instance with 80 000 permanent TCP connections, the SIP 
server could still handle at least 1000 requests per second and a 
connection arrival rate of 1000 new connections per second, done for 20 
000 new connections. CPU load generated by the SIP server was from 6% to 8%.

I added a new section to the draft notes to list the enhancements done 
for the latest stable release (v3.1.x) that contribute to performance 
improvements, like asynchronous TLS, fine tuning of memory for TLS 
connections and raw UDP sockets.

Cheers,
Daniel

-- 
Daniel-Constantin Mierla -- http://www.asipto.com
http://linkedin.com/in/miconda -- http://twitter.com/miconda