I am developing a simple redirect server on Windows 2008 Server. When an
invite arrives, the handler performs a database lookup, and then returns a
302 response with the database response in the Contact field. The database
access is about 15-30 milliseconds even under high load. What I am seeing
are performance issues I would not expect. Performance is OK up to about 30
invite messages per second. Then I start to see significant lag occurring.
What happens is that I see log messages indicating the response has be
sent, however, wireshark is indicating that the 302 may not go out until
after a significant delay. At 30 messages per second I see delays of 1-2
seconds. Not extreme but it is a concern. When I start running loads up to
50-100 invites per second I start to see large delays (15-30 seconds) from
arrival of the invite to return of the 302. I am confident the delay is not
in the database lookup.
I have two questions. What kind of considerations should I make to optimize
performance of the Sofia-SIP stack? The other question is, can someone
provide me with some guidance in how to go about troubleshooting this issue?
I have run out of ideas on isolating the problem.
Jonathan
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