5 Apr
2024
5 Apr
'24
12:44 p.m.
Thank you all for helping! I wasn't expecting such a large number of
replies!
I ended up partially solving the issue with a different approach.
Modifying the size of the UDP Buffer did not reveal any improvement.
However, modifying the memory management did improve a lot: from 330 CPS to
1800 CPS in stateful mode.
So, starting kamailio with the following command:
kamailio -M 256 -m 128 -f <script.cfg>
did the trick! And the VM is still running with 6 vCPU.
Still very far from the test results described in
https://www.kamailio.org/docs/openser-performance-tests/#tm-tests-c but a
lot better and meets our requirements
Thanks guys for your help! Greatly appreciated!
*Sérgio Charrua*
On Sun, Mar 24, 2024 at 4:28 PM Alex Balashov via sr-users <
sr-users(a)lists.kamailio.org> wrote:
Not really related to the ongoing discussion, but:
Going to that kind of CPS might exceed the natural limits of all but the
most exquisitely tuned execution environments. It probably wouldn't work at
all on the average moderately oversubscribed public cloud VM, even a
generously resourced one.
Once you get to that point, you might be better off just scaling
horizontally.
-- Alex
On Mar 23, 2024, at 11:26 PM, Ovidiu Sas
<osas(a)voipembedded.com> wrote:
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(a)lists.kamailio.org> wrote:
> On Mar 23, 2024, at 9:30 PM, Ovidiu Sas <osas(a)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.
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.
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
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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--
Alex Balashov
Principal Consultant
Evariste Systems LLC
Web: https://evaristesys.com
Tel: +1-706-510-6800
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