All mentioned boxes are VMWare VMs probably configured with default drivers
and settings.
Unfortunately, I don't know which network equipements are used when those
boxes communicate with each other.
So yes, maybe I banged into an unexpected limit because of this ignorance.

Anyway, from my testing, I was mostly surprised  by 2 things:

1- I consistently hit a 200 calls when I let run an Asterisk instance on
the SIPp (calls passing locally from SIPp to a first Asterisk instance
before hitting SUT): I thought that communications inside a given VM was
"unlimited and cheap" and I was apparently wrong,
Disabling Asterisk in my first VM allowed me to hit a 500 limit at the
price of loosing Asterisk flexibility to log RTCP stats, select exotic
codec and so on.

2- Increasing asterisk.conf's maxfiles value (from 10000 to 40000, for
instance), allowed me to get more than 695 successfull call out of 700 but
I could succeed to get, even once, 700 successfull calls, even when I tried
with my current 400000 maxfiles limit.

2018-03-06 23:35 GMT+01:00 Bruce Ferrell <bferr...@baywinds.org>:

>
> On 03/06/2018 01:58 PM, Olivier wrote:
>
>> Hello,
>>
>> I'm running load testing sessions.
>> My System Under Test is an asterisk 13 with 16GB, configured with
>> maxfiles set to 400 000.
>> This system is supposed do produce simple SIP trunking services without
>> transcoding.
>>
>>
>> The box sending call to my System Under Test is anabled with SIPp.
>> I'm banging on a 700 concurrent calls/50 CAPS limit I would like to
>> improve, if possible.
>>
>> Tests are done with both signaling and media like this:
>>
>> SIPp <---> SUT (asterisk 13) <---> Asterisk box echoing media
>>
>> I checked bandwidth first and got 930 Mb/s on each leg (from SIPp to SUT
>> or SUT to echoing box) using iperf3 TCP testing though my target relies on
>> UDP
>>
>>
>> My questions are:
>>
>> 1. Have you ever noticed a better scalability using UDP or TCP ?
>>
>> 2. Where do Retransmission I'm observing on SIPp console most probably
>> come from ? Network issues ? My SIPp not beeing correctly tuned ? Lack of
>> resources somewhere ?
>>
>> 3. Recommandations ? Suggestions ?
>>
>> Best
>>
>>
>> I do network management for a living.
>
> In your description, I see nothing to describe the network other than an
> observed 930Mb/s.
>
> What is the network configuration;  What NIC(s), switches etc.
>
> Treating these as effectively "unlimited" is a certain recipe for banging
> into unexpected limits.
>
> Different NICs and switchs can and do provide differing levels of
> performance.
>
>
>
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