possible performance regression in Kamailio 6.1 release related to TCP/TLS

Hello,

we have noticed a possible performance regression related to TCP/TLS in the Kamailio 6.1.x release when installed from packages or from source with cmake, and in Kamailio 6.0 releases only when installed from source with cmake.

There was a change introduced by mistake that disabled certain polling functionality related to the internal TCP stack. It can be observed at startup, or by executing "kamailio -I". See below for further information.

This was fixed today in git master, 6.1 and 6.0 branches. Commit ids are: 54572ce96, f1a333b37b, b906c409.

I believe that it should be only noticeable if you are having a high number of connected devices and/or a high connection rate.

The mentioned fix will be included in the next minor releases of 6.1 and 5.8., as usual.

Best regards,

Henning Westerholt




  1.  Verification in log files
     *   Affected:

kamailio: INFO: <core> [core/tcp_main.c:5264]: init_tcp(): using poll as the io watch method (auto detected)

     *   Unaffected:

kamailio: INFO: <core> [core/tcp_main.c:5264]: init_tcp(): using epoll_lt as the io watch method (auto detected)



  1.  Verification in Kamailio binary:
     *   Affected:

$ kamailio -I | grep "poll methods"

TCP poll methods: poll

     *   Unaffected:
$ kamailio -I | grep "poll methods"
TCP poll methods: poll, epoll_lt, epoll_et, sigio_rt, select


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