Hello Daniel,

I am wondering if your issues are specific to KEMI, e.g. if you’ve also tried the same script logic with a native cfg and observing similar numbers? If it’s a simple script, you can maybe just repeat the same test. There were benchmarks done for KEMI some years ago which only showed a small performance difference.

Or do you have generic performance issues which you just happened to observe in your test with KEMI? In this case it would be more of a generic performance optimization topic.

Cheers,

Henning

--

Henning Westerholt – https://skalatan.de/blog/

Kamailio services – https://gilawa.com

From: Daniel W. Graham via sr-users <sr-users@lists.kamailio.org>
Sent: Sonntag, 12. Januar 2025 08:21
To: sr-users@lists.kamailio.org
Cc: Daniel W. Graham <dan@cmsinter.net>
Subject: [SR-Users] Performance issues with KEMI

Testing out KEMI functionality and running into performance issues. If I exceed 150 calls per second the network receive queue grows and Kamailio is unable to keep up with requests and they begin dropping.

KEMI script for testing is just doing a stateless reply to invites.

Using python3s module.

I've played with Kamailio child processes and memory allocations, but there is no impact. I've also attempted some buffer / memory tweaking at the OS level, again with no impact. Increasing CPU cores and even running the test on bare metal results in the same.

Example of receive queue at 150 calls per second -

Netid State       Recv-Q      Send-Q   Local Address:Port  

udp   UNCONN      337280      0       x.x.x.x:5060

Just wondering if anyone has experienced similar issues or has an example of the performance they are seeing before I continue down this path.

Thanks,

- dan