Listen backlog for stream servers


Listen backlog in Nginx defaults to NGX_LISTEN_BACKLOG=511 on Linux &
other platforms (excepting FreeBSD & MacOS), not to system somaxconn
(why does it differ for different OSes?).

It’s not a problem to increase it using «backlog» option of «listen»
directive for HTTP servers
but there is no such option for stream server

Is there any proper way to increase listen queue length for stream
server (without patching source code) or globally? Seems to be a subject
to fix.