[OpenSIPS-Users] TCP Performance profiling

[Pete Kelly]

Hello all

I am running some OpenSIPS proxies which are talking to each other
exclusively in TCP, however when performing some (mild) load tests I am
seeing some strange behaviour from time to time, which manifests itself as
what looks like OpenSIPS taking a long time to process SIP requests.

The most obvious issue I am seeing (and confirmed by tcpdump) is when
OpenSIPS receives an invite but may take anything from 2-8 second to even
send the 100 Trying!

e.g.

T 2025/04/10 20:28:10.257283 10.3.0.4:48665 -> 10.3.0.12:5080 [A] #4826

INVITE sip:... SIP/2.0.

T 2025/04/10 20:28:12.644355 10.3.0.12:5080 -> 10.3.0.4:48665 [AP] #4955

SIP/2.0 100 Giving it a try.

Is there an obvious route for me to debug this behaviour to try and see
where the bottleneck may lie ? Can I see somewhere if all of the tcp
workers are in use for example and it is waiting for a worker?

Pete
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