Mercurial > hg > nginx
diff src/core/ngx_connection.c @ 6153:4f6efabcb09b
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.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Wed, 20 May 2015 15:51:56 +0300 |
parents | adba26ff70b5 |
children | 3096ae76ba47 |
line wrap: on
line diff
--- a/src/core/ngx_connection.c +++ b/src/core/ngx_connection.c @@ -91,6 +91,43 @@ ngx_create_listening(ngx_conf_t *cf, voi ngx_int_t +ngx_clone_listening(ngx_conf_t *cf, ngx_listening_t *ls) +{ +#if (NGX_HAVE_REUSEPORT) + + ngx_int_t n; + ngx_core_conf_t *ccf; + ngx_listening_t ols; + + if (!ls->reuseport) { + return NGX_OK; + } + + ols = *ls; + + ccf = (ngx_core_conf_t *) ngx_get_conf(cf->cycle->conf_ctx, + ngx_core_module); + + for (n = 1; n < ccf->worker_processes; n++) { + + /* create a socket for each worker process */ + + ls = ngx_array_push(&cf->cycle->listening); + if (ls == NULL) { + return NGX_ERROR; + } + + *ls = ols; + ls->worker = n; + } + +#endif + + return NGX_OK; +} + + +ngx_int_t ngx_set_inherited_sockets(ngx_cycle_t *cycle) { size_t len; @@ -106,6 +143,9 @@ ngx_set_inherited_sockets(ngx_cycle_t *c #if (NGX_HAVE_DEFERRED_ACCEPT && defined TCP_DEFER_ACCEPT) int timeout; #endif +#if (NGX_HAVE_REUSEPORT) + int reuseport; +#endif ls = cycle->listening.elts; for (i = 0; i < cycle->listening.nelts; i++) { @@ -215,6 +255,25 @@ ngx_set_inherited_sockets(ngx_cycle_t *c #endif #endif +#if (NGX_HAVE_REUSEPORT) + + reuseport = 0; + olen = sizeof(int); + + if (getsockopt(ls[i].fd, SOL_SOCKET, SO_REUSEPORT, + (void *) &reuseport, &olen) + == -1) + { + ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_socket_errno, + "getsockopt(SO_REUSEPORT) %V failed, ignored", + &ls[i].addr_text); + + } else { + ls[i].reuseport = reuseport ? 1 : 0; + } + +#endif + #if (NGX_HAVE_TCP_FASTOPEN) olen = sizeof(int); @@ -332,6 +391,31 @@ ngx_open_listening_sockets(ngx_cycle_t * continue; } +#if (NGX_HAVE_REUSEPORT) + + if (ls[i].add_reuseport) { + + /* + * to allow transition from a socket without SO_REUSEPORT + * to multiple sockets with SO_REUSEPORT, we have to set + * SO_REUSEPORT on the old socket before opening new ones + */ + + int reuseport = 1; + + if (setsockopt(ls[i].fd, SOL_SOCKET, SO_REUSEPORT, + (const void *) &reuseport, sizeof(int)) + == -1) + { + ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_socket_errno, + "setsockopt(SO_REUSEPORT) %V failed, ignored", + &ls[i].addr_text); + } + + ls[i].add_reuseport = 0; + } +#endif + if (ls[i].fd != (ngx_socket_t) -1) { continue; } @@ -370,6 +454,32 @@ ngx_open_listening_sockets(ngx_cycle_t * return NGX_ERROR; } +#if (NGX_HAVE_REUSEPORT) + + if (ls[i].reuseport) { + int reuseport; + + reuseport = 1; + + if (setsockopt(s, SOL_SOCKET, SO_REUSEPORT, + (const void *) &reuseport, sizeof(int)) + == -1) + { + ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno, + "setsockopt(SO_REUSEPORT) %V failed, ignored", + &ls[i].addr_text); + + if (ngx_close_socket(s) == -1) { + ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno, + ngx_close_socket_n " %V failed", + &ls[i].addr_text); + } + + return NGX_ERROR; + } + } +#endif + #if (NGX_HAVE_INET6 && defined IPV6_V6ONLY) if (ls[i].sockaddr->sa_family == AF_INET6) {