[SR-Users] Kamailio ​ds_ping_interval Performance

[Julien Chavanton]

Hi,

I would set it to a low value to make sure you avoid sending calls a
Freeswitch server facing problems, in the case of Freeswitch the same GW
will also handle media, if it is having hardtime repliyng to SIP OPTIONS it
will very likely have problem handling the media.

It may also get worst during the call even stop responsding and loose
transaction in progress or in dialog transactions later like session timers
and BYEs.

Off loading it may able help other calls already using it.


You may push your strategy further thinking about :

- The risk is that you run out of GW, could be handled when ds_select is
returning nothing.
- Another side effect, would be that you are sending more traffic to other
GW, they must be able to handle the extra load.

In kamailio 5 there is a new algorithm that behaves better when one GW is
put out of service.

“11” - use relative weight based load distribution. You have to set the
attribute 'rweight' per each address in destination set. Active host usage
probability is rweight/(SUM of all active host rweights in destination
group).

Regards
Julien

On Mon, Apr 2, 2018 at 6:06 PM, Atul Thosar <atulthosar at gmail.com> wrote:

> Hi All,
> I am using Kamailio
> ​*​*
> *v4.4.x* to load balanced traffic to FreeSWITCH servers. I have query
> regarding ds_ping_interval and ds_probing_threshold. We have very high
> traffic (around 200-400
> ​ (CPS)​
> calls per sec) hitting on Kamailio which then distribute it to 2-3
> FreeSWITCH servers.
> ​ ​
> What is the optimal value should I set to ds_ping_interval and
> ds_probing_threshold?
>
> If I set
> ​​
> ds_ping_interval=2 and
> ​​
> ds_probing_threshold=1 then in every 2 sec, I would come to know if my
> ​​
> FreeSWITCH server is down/up. But by setting such low values, I afraid
> there would
> ​be ​
> lot of SIP traffic on network.
> ​ If I set high (say
> ​
> ds_probing_threshold=5) then I may loose high number of calls (200 CPS, I
> will loose 1000 calls) in case
> ​
> FreeSWITCH server is down. ​
>
>
> As I said earlier we have very high traffic hitting on Kamailio, can't
> kamailio use INVITE itself to probe FreeSWITCH server is down/up? In case
> of low traffic can't it switch over to OPTION mechanism?
>
> --
> ​Thanks in Advance​
> ,
> ​​
> Atul
> ​​
> ​​
> ​​
>
>
>
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