### Description
During our tls conn performance test for kamailio, we found fixed shared momory
700MB can only support around 9600 concurrent TLS connections. At the same
time, we use nginx for comparison to do the same same tls conn performance
test, and the result is 9600 concurrent TLS connections only cost 72MB virtual
memory(nginx dont support global shared memory pool for each allocate. it use
openssl internal allocate function)
Of course, we know, nginx does not use shared memory, and they are not much
comparable. Please check if there is any solution to save some shmmem SSL
session takes.
### Expected behavior
kamailio use less shared memory for more TLS connections
#### Actual observed behavior
kamailio 's tls connection shared memory consists of tcpconn structure info and
tcp_rd_buf and SSL session info, which are all in the same shared memory pool.
As our observation, a ssl session info takes too many shmmem---around 130KB
#### Debugging Data
None
#### Log Messages
None
#### SIP Traffic
None
### Possible Solutions
None
### Additional Information
None
* **Operating System**:
Linux localhost.localdomain 3.10.0-327.el7.x86_64 #1 SMP Thu Nov 19 22:10:57
UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
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