Hello,

is the same operating system and server, or are you using some other machine for the new version? I can't remember right now any big change in tcp/tls side, besides sni, which should not have any relevant impact as described here.

Also, have you installed from git branch 4.2 or the tarball/packages of 4.2.6?

Cheers,
Daniel

On 15/10/15 03:36, Tristan Mahé wrote:
Hi List,

I've been reaching a strange thing lately, trying to upgrade to kamailio
4.2.6 ( identical config ):

- 35% loss of performance on TLS connections ( Sipp REGISTER scenario,
easily reproduced ).
- more TCP workers needed to ease the TCP queues ( 32 workers on 3.3.7,
at least 64 are needed on 4.2.6 to avoid "queue full" messages in logs ).
- kamailio 4.2.6 intermittent processing of requests ( Kamailio stops
accepting new tcp connections, then resume a bit later, then stops
again,... ) => starts happening when Kamailio is treating more than 20k
tcp connections, with between 500-1k req/s. During those periods, trying
to connect to kamailio with an openssl s_client -connect will end up in
a timeout or with a long delay before the certificate is received ( 03
CONNECTED ).
- kamailio 4.2.6 dropping connections, kamailio 3.3.7 keeping those
connections: after a while, the number of active connections starts to
decrease on kam4, on kam3 it stays constant.

I was wondering if I was alone in this situation or if someone else is
impacted, has some advices ?

It does not seem to be a config issue, as it is the same that was
deployed with both versions.



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