[OpenSIPS-Users] TCP Performance profiling

[Bogdan-Andrei Iancu]

Hi Pete,

Try the script_trace() function, to see if the delay comes from the 
script level. If not, it means it comes from the TCP layer (maybe 
related to the dispatching of TCP cons between workers)
https://www.opensips.org/Documentation/Script-CoreFunctions-3-5#script_trace

BTW, what are the TCP settings for:
https://www.opensips.org/Documentation/Script-CoreParameters-3-5#tcp_parallel_read_on_workers
https://opensips.org/html/docs/modules/3.5.x/proto_tcp.html#idp5528016

Regards,

Bogdan-Andrei Iancu

OpenSIPS Founder and Developer
   https://www.opensips-solutions.com
   https://www.siphub.com

On 10.04.2025 23:42, Pete Kelly wrote:
> 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 <http://10.3.0.4:48665> -> 
> 10.3.0.12:5080 <http://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 <http://10.3.0.12:5080> -> 
> 10.3.0.4:48665 <http://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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