[sr-dev] congestion control priority for priority based dispatching

[Daniel-Constantin Mierla]

Hello,

maybe a dedicated module is going to be too complex or better said,
duplicate a lot of code for management of the destinations,
load/reload/keepalive, ... (although I won't have anything against such
approach, if considered better by developer).

However, if done in dispatcher, I think that a new algorithm id should
be used, leaving 8 as it is. Also, there should be a new field added in
the internal structure to keep this "dynamic" priority -- it can be
initialized to the "priority" value.

In some cases I use different algorithms for the same group of
destinations, so it would be good to be able to use algorithm 8 with
priority from database and the new algorithm at the same time.

Cheers,
Daniel

On 27.05.20 21:46, Henning Westerholt wrote:
>
> Hi Julien,
>
>  
>
> sounds interesting, a “location optimized routing mode”. What about
> making it as a dedicated mode, to not overloading the mode “8”?
>
>  
>
> Cheers,
>
>  
>
> Henning
>
>  
>
> -- 
>
> Henning Westerholt – https://skalatan.de/blog/
>
> Kamailio services – https://gilawa.com <https://gilawa.com/>
>
>  
>
> *From:* sr-dev <sr-dev-bounces at lists.kamailio.org> *On Behalf Of
> *Julien Chavanton
> *Sent:* Thursday, May 14, 2020 7:26 PM
> *To:* Kamailio (SER) - Development Mailing List
> <sr-dev at lists.kamailio.org>; Kamailio (SER) - Users Mailing List
> <sr-users at lists.kamailio.org>
> *Subject:* [sr-dev] congestion control priority for priority based
> dispatching
>
>  
>
> Hi Folks,
>
>
> Just found another simple use case of the dispatcher latency stats.
>
> Just shraing this idea of a feature I want to contribute.
>
>
> When using dispatcher algorithm 8:
>
>    “8” - select destination sorted by priority attribute value (serial
> forking ordered by priority).
>
> If the gateway as the attribute, the priority becomes the estimated
> latency.
>
>    cc-priority
>
>  
>
> - The dispatcher would automatically prioritize the closest one.
>
> - If a gateway is becoming unresponsive it will automatically become
> de prioritize.
>
>
> Consider this real life scenario where you have gateways in East and
> West Coast
>
> Example
>
>
> URI: sip:28.71.19.140                                                
>                                                                      
>                                                                
> FLAGS: AP
> PRIORITY: 10
> ATTRS: {
>         BODY: cc_priority=1
> }
> LATENCY: {
>         AVG: 84.001000
>         STD: 0.062000
>         EST: 84.001000 (high == low priority)
>         MAX: 93
>         TIMEOUT: 0
> URI: sip:28.71.16.140
> FLAGS: AP
> PRIORITY: 10
>
> ATTRS: {
>         BODY: cc_priority=1
> }
>
> LATENCY: {
>         AVG: 29.110000
>         STD: 2.383000
>         EST: 31.999000 (low == high priority)
>         MAX: 1499
>         TIMEOUT: 1
>
>  
>
>  
>
> Another major improvement to all of this would be to gather stats on
> INVITE <> 100 to have a very accurate latency estimation even if the
> gateway does not support SIP OPTIONS pings
>
>  
>
>  
>
>
> _______________________________________________
> Kamailio (SER) - Development Mailing List
> sr-dev at lists.kamailio.org
> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-dev

-- 
Daniel-Constantin Mierla -- www.asipto.com
www.twitter.com/miconda -- www.linkedin.com/in/miconda
Funding: https://www.paypal.me/dcmierla

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