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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