[Freeswitch-users] concurrent calls capacity planning

[Ken Rice]

Capacity planning is not something we typically do under community support,
changing 1 thing can lead to wildly different (ie: orders of magnitude)
performance differences... 

You amy want to contact consulting at freeswitch.org for assistance here as
your specific end goals greatly impact how things will end up performing

-----Original Message-----
From: freeswitch-users-bounces at lists.freeswitch.org
[mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of Niranjan
kl
Sent: Wednesday, March 30, 2016 8:45 AM
To: freeswitch-users at lists.freeswitch.org
Subject: [Freeswitch-users] concurrent calls capacity planning

We started using freeswitch for one of our products. We use esl to control
calls. I am trying to come up with numbers to do capacity planning. I ran my
tests on 8 core cpu 16 GB Ram server. This is on ubuntu 14.04 linux (kernel
3.13) distro on amazon web services. I used sipp to do load tests. I used
freeswitch's external profile (single profile only) as I will have to deal
with third party SIP trunk providers and G711 is the codec I used. When I
executed 500 concurrent calls by creating 500 calls at  the same time,
things work fine. I see linux's load staying close to 3. When I do 1000
concurrent calls by creating 1000 calls at the same time, linux's load
shoots to 75 and sometimes reaching 100. Earlier, I did the same test on 4
core 8 GB server, load shot up to 75 for 500 concurrent calls.
When I searched for freeswitch installation on aws, I read that timer
configuration and low latency kernel changes are recommended. But It also
says it is not needed for 3.x kernel. So, Is this needed to extract good
performance from hardware on aws ? Instead of adding hardware blindly, I
would like to figure out is there any other way I can profile this and
understand the relationship between hardware and concurrent calls number.

Thanks,
Niranjan KL

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