Date: Fri, 12 Jul 2013 22:16:31 -0700 From: trafdev <trafdev@mail.ru> To: freebsd-net@freebsd.org Subject: SO_REUSEPORT: strange kernel balancer behaviour Message-ID: <51E0E2AF.7090404@mail.ru>
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Hello.
Could someone help with following problem of SO_REUSEPORT.
Created server:
int sockd_acceptor_;
...
if ((sockd_acceptor_ = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
LOG4CXX_ERROR_ERRNO(kLogger, "socket");
return false;
}
struct sockaddr_in sa_in;
memset(&sa_in, 0, sizeof(sa_in));
sa_in.sin_family = AF_INET;
sa_in.sin_port = htons(port);
sa_in.sin_addr.s_addr = htonl(INADDR_ANY);
int yes = 1;
if (setsockopt(sockd_acceptor_, SOL_SOCKET, SO_REUSEPORT, &yes,
sizeof (yes)) == -1) {
LOG4CXX_ERROR_ERRNO(kLogger, "setsockopt");
return false;
}
if (bind(sockd_acceptor_, (const struct sockaddr*)&sa_in,
sizeof(sa_in)) == -1) {
LOG4CXX_ERROR_ERRNO(kLogger, "bind");
return false;
}
if (listen(sockd_acceptor_, listen_backlog) == -1) {
LOG4CXX_ERROR_ERRNO(kLogger, "socket listen");
return false;
}
if (!fcntl_set(sockd_acceptor_, O_NONBLOCK))
return false;
Then libev is used as async dispatcher.
Server process 1 started, server process 2 started.
Everything is good so far, no bind errors.
Client started.
Server process 1 starts to reply, process 2 gets no requests yet.
This happens until process 1 is killed. Immediately after that process 2
starts to respond (gets requests from client).
So it looks like there is a deque of processes sharing same port
(SO_REUSEPORT) and only one process may respond.
Is this an expected behavior?
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