2008/9/10 Fabio Margarido <[EMAIL PROTECTED]>: > I'm observing some strange behavior from sofia-sip when running heavy load > tests on my application. > The application is a B2BUA and the calls are originated by a SIPp script. > The receiving end is another machine running a UAS SIPp script. > When we start 500 calls per second, limited to 20000 simultaneous calls with > 100 seconds conversation time, the fist wave of calls are established with > no errors or retransmissions. But as soon as these 20000 first calls start > to hangup and the subsequent calls are simultaneously generated, we see a > lot of retransmissions and unexpected messages in SIPp. When this happens, > sofia-sip starts printing "strange ACK from <IP>" messages on the screen. > I've managed to isolate one call which showed odd behavior. We can see the > INVITE received by Sofia, and the 200 OK response. After SIPp sends an ACK, > a lot of 200 OK retransmissions exist, separated by approximately 10 usecs. > Sofia then sends a BYE to this call even before SIPp has a chace to > retransmit the ACKs, which come afterwards. > Pekka, do you have any clue what might be happening?
In principle, this should not happen. ;) > Can I get any other > data to help understand this issue? Profiling data would be useful, e.g,, there might be somewhere that stack spends far too much time which starves the retransmission handling. > If you want the trace I can provide it. A trace would be excellent, preferrably tcpdump on both hosts running sipp and Sofia. -- Pekka.Pessi mail at nokia.com ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Sofia-sip-devel mailing list Sofia-sip-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sofia-sip-devel
