Re: [sr-dev] [Fwd: Re: [Kamailio-Users] TCP supervisor process in Kamailio]

On Jul 07, 2009 at 15:53, Klaus Darilion <klaus.mailinglists(a)pernau.at> wrote: The elevated priority for tcp_main is a good idea. I'll add a config option for it (right now there are real time prio config options, but only for the timer processes). The rest of the paper does not apply to sr or recent ser versions (fd cache was implemented long time ago, tcp timers are much better, there is no known dealdock a.s.o.). I also don't agree with what they are trying to prove (that TCP is comparable with UDP in terms of scalability). While there might have been some performance problems in early TCP implementations (and there are still a few even in sr, at least until I'll add fd sharing), you could never make sip over TCP use so few resources as sip over UDP. It's not only slower (due to the extra complexity in dealing with TCP connections, both in kernel and userspace, and due to the extra parsing needed to find SIP message boundaries on TCP), but it uses way more resources (lots of FDs, and lots of memory). The same could be said also for SCTP. UDP is still the best option in terms of performance and resources used. Andrei