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socket: add support for tcp nagle

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This patch adds support for TCP TCP_NODELAY socket option. This can be
configured via NoDelay conf parameter. TCP Nagle's algorithm works by
combining a number of small outgoing messages, and sending them all at
once.  This controls the TCP_NODELAY socket option.
This commit is contained in:
Susant Sahani 2014-07-28 12:18:29 +05:30 committed by Lennart Poettering
parent e9e74f28d7
commit 4427c3f43a
4 changed files with 21 additions and 0 deletions
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11
man/systemd.socket.xml
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@ -487,6 +487,17 @@
<option>false</option>.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>NoDelay=</varname></term>
<listitem><para>Takes a boolean
argument. TCP Nagle's algorithm works by combining a number of
small outgoing messages, and sending them all at once.
This controls the TCP_NODELAY socket option (see
<citerefentry><refentrytitle>tcp</refentrytitle><manvolnum>7</manvolnum></citerefentry>
Defaults to
<option>false</option>.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>Priority=</varname></term>
<listitem><para>Takes an integer

1
src/core/load-fragment-gperf.gperf.m4
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@ -231,6 +231,7 @@ Socket.DirectoryMode, config_parse_mode, 0,
Socket.Accept, config_parse_bool, 0, offsetof(Socket, accept)
Socket.MaxConnections, config_parse_unsigned, 0, offsetof(Socket, max_connections)
Socket.KeepAlive, config_parse_bool, 0, offsetof(Socket, keep_alive)
Socket.NoDelay, config_parse_bool, 0, offsetof(Socket, no_delay)
Socket.Priority, config_parse_int, 0, offsetof(Socket, priority)
Socket.ReceiveBuffer, config_parse_iec_size, 0, offsetof(Socket, receive_buffer)
Socket.SendBuffer, config_parse_iec_size, 0, offsetof(Socket, send_buffer)

8
src/core/socket.c
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@ -480,6 +480,7 @@ static void socket_dump(Unit *u, FILE *f, const char *prefix) {
"%sSocketMode: %04o\n"
"%sDirectoryMode: %04o\n"
"%sKeepAlive: %s\n"
"%sNoDelay: %s\n"
"%sFreeBind: %s\n"
"%sTransparent: %s\n"
"%sBroadcast: %s\n"
@ -494,6 +495,7 @@ static void socket_dump(Unit *u, FILE *f, const char *prefix) {
prefix, s->socket_mode,
prefix, s->directory_mode,
prefix, yes_no(s->keep_alive),
prefix, yes_no(s->no_delay),
prefix, yes_no(s->free_bind),
prefix, yes_no(s->transparent),
prefix, yes_no(s->broadcast),
@ -790,6 +792,12 @@ static void socket_apply_socket_options(Socket *s, int fd) {
log_warning_unit(UNIT(s)->id, "SO_KEEPALIVE failed: %m");
}
if (s->no_delay) {
int b = s->no_delay;
if (setsockopt(fd, SOL_TCP, TCP_NODELAY, &b, sizeof(b)) < 0)
log_warning_unit(UNIT(s)->id, "TCP_NODELAY failed: %m");
}
if (s->broadcast) {
int one = 1;
if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &one, sizeof(one)) < 0)

1
src/core/socket.h
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@ -134,6 +134,7 @@ struct Socket {
/* Socket options */
bool keep_alive;
bool no_delay;
bool free_bind;
bool transparent;
bool broadcast;