In nginx docs I see sndbuf option in listen directive.
Is there something that I don't understand about it, or developers of nginx don't understand meaning of sndbuf... but I do not see a point to set sndbuf on a listening socket. It just does not make any sense!
sndbuf/rcvbuf is needed perhaps for an upstream proxy connection, or for a connected socket (from outside), but it just have no meaning to set that on a listening socket. Total nonsense.