It all depends on the hardware, but I noticed that after you pass 3-4k cps you run into this kind of issues.

- ovidiu

On Sat, Mar 23, 2024 at 22:11 Alex Balashov via sr-users <sr-users@lists.kamailio.org> wrote:

> On Mar 23, 2024, at 9:30 PM, Ovidiu Sas <osas@voipembedded.com> wrote:
>
> In the end, we agree with each other and my feeling is that we are repeating the same concept.

Yeah, I think that's mostly right.

> In most of my deployments I don’t need to mess with the udp queue size.
> For high cps traffic, from my experience, it’s a must.

Although I don't deal with very high-CPS deployments (500-1000 CPS) much these days, I used to, and my experiences there led me to the diametrically opposite conclusion: one should never increase the UDP queue size, and if you find yourself doing that, you're doing something wrong, _except_ in the occasional burst case we discussed.

You can be absolutely sure that when I first encountered the problem, my first impulse was to increase the receive queue as high as it will go, then, gradually, to a lesser extent. I ultimately found that the proper amount by which to raise it is 0. ;)

-- Alex

--
Alex Balashov
Principal Consultant
Evariste Systems LLC
Web: https://evaristesys.com
Tel: +1-706-510-6800

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