[OpenSIPS-Users] REG::Opensips V1.11.5 & V1.11.10 Duplicate TCP Conections

[Răzvan Crainea]

Hi, Ravitez!

You are right - if opensips gets multiple messages in parallel that need 
to get to a single destination, each process will open a different 
connection to that destination. However, all sequential messages will 
use a single TCP connection.
Synchronizing all the TCP actions to ensure you will have a single 
connection might be a bit overkill in terms of performance.

May I ask if this is a problem for you? Can you detail a bit why?

Best regards,

Răzvan Crainea
OpenSIPS Solutions
www.opensips-solutions.com

On 05/04/2017 04:11 PM, Ravitez Ravi wrote:
> Hi All,
>         Good Day,
>         I have been seeing opensips creating mutiple(duplicate) TCP 
> connections to the same destination if hit with heavy call load.
>
> *What do i mean?*
> opensips ip : 10.10.10.1
> Destination  : 10.10.10.2
> Tcp Children : 32
>     Ideally opensips will create only one tcp connections and reuses 
> it,if there's a heavy call load i see there are several tcp 
> connections which are created to the same destination.
>     I believe here's the root cause :
>     - When a child tries to find a connection to the destination it 
> calls _tcpconn_find() (assuming we are using ip and not id) system 
> checks tcpconn_aliases_hash for the connection info.
>       this map is maintained by the parent process and each child lock 
> its while reaing tcpconn_get().in order to simulate the scenario lets 
> assume a->parent->state is BAD this method
>       will return null and so the child tries to create a new 
> connections,assuming there's a second child trying to find the same 
> connections and goes through the same process
>
>   - Now each child thinks there's no connection to the destination and 
> calls tcpconn_connect() this will create a socket to the destination 
> and passes over the fd to the
>     main process to update the has map.
>
>   - Not sure if tcp_connect() should have locking mechanism as in 
> tcpconn_get().
>
>
>
> Please correct me if my understanding is wrong,please share your thoughts.
> Thank you.
>
>
>
> Regards,
> Ravitez.D
>
>
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