tree 8a458d848d86e6b0e7f9108fd1b792d709091965
parent 90dd638654a559e75e1741fa9f54773c5c154a0d
author Maxim Dounin <mdounin@mdounin.ru> 1432126316 +0300
committer Maxim Dounin <mdounin@mdounin.ru> 1432126316 +0300

The "reuseport" option of the "listen" directive.

When configured, an individual listen socket on a given address is
created for each worker process.  This allows to reduce in-kernel lock
contention on configurations with high accept rates, resulting in better
performance.  As of now it works on Linux and DragonFly BSD.

Note that on Linux incoming connection requests are currently tied up
to a specific listen socket, and if some sockets are closed, connection
requests will be reset, see https://lwn.net/Articles/542629/.  With
nginx, this may happen if the number of worker processes is reduced.
There is no such problem on DragonFly BSD.

Based on previous work by Sepherosa Ziehau and Yingqi Lu.