I don't know that I would do that. If your server isn't coping with the load, making the kernel receive queue deeper doesn't increase throughput, it just relocates the queueing -- or rather, adds another layer of queueing.

Squeeze the balloon in one place, it inflates in another.

-- Alex

> On Mar 22, 2024, at 1:05 PM, Ovidiu Sas via sr-users <sr-users@lists.kamailio.org> wrote:
>
> I assume that you are using udp.
> Please increase the length of the udp queue:
> https://medium.com/@CameronSparr/increase-os-udp-buffers-to-improve-performance-51d167bb1360
>
> Regards.
> Ovidiu Sas
>
>
> On Fri, Mar 22, 2024 at 12:56 Sergio Charrua via sr-users <sr-users@lists.kamailio.org> wrote:
> Hi all!
>
> I have been doing some performance tests with Kamailio 5.7.4 and SIPp.
> The infrastructure is as follows:3 VMs running on VMWare ESXi running:
> UAC on 10.20.0.1 with SIPP-> Kamailio on 10.20.0.5 -> UAS on 10.20.0.3
>
> The Kamailio VM has 6 dedicated vCPU of type Intel(R) Xeon(R) Silver 4216 CPU @ 2.10GHz and, 2 NICs and 4Gb RAM and MariaDB 10.6 as DB Backend., all running on a HP G380 host with a gazillion CPUs and a googol disk space!
>
> I currently have 3 scripts:
> - script #1 stateful with RTJson and simulating requests to routing engine and accounting
> - script #2 stateful but with just a simple routing to UAS, no rules, no DB,
> - script #3 stateless with a forward to UAS
>
> With script #3 I can go up to 2000CPS without issues with CPU at 37%! Above that value, I get retransmissions everywhere.
> On both scripts #1 and #2, the limit is 330CPS max after which I get a lot of retransmissions, while CPU/Core usage on Kamailio server stays below 10%.
> So I do not expect this to be a CPU issue.
>
> I could not understand why such (low) results, so I followed this article found at
>  https://www.kamailio.org/docs/openser-performance-tests/#tm-tests-c
> and created exact same scenarios, with kamailio script and SIPP templates available on the article, hoping for better results.
> But I get the same results: between 300 and 330CPS which is far, very far from the 7000CPS found in the article!
>
> I understand that I'm using VMs and probably the tests made for the article, which is pretty old already, were made on physical servers. Still, I would not expect 95% of lower performance!
>
> Any clue what could be the issue? I suspect NICs, but....
> Any tips anyone could share?
>
> Thanks in advance!
>
> Sérgio Charrua
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--
Alex Balashov
Principal Consultant
Evariste Systems LLC
Web: https://evaristesys.com
Tel: +1-706-510-6800

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