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Disable slow-start on TCP sockets

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Leaving Nagle's algorithm enabled on the TCP transport leads to some
really long latencies (at least, during the first several messages).

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=75544
Reviewed-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
This commit is contained in:
Matt Hoosier 2014-02-26 08:29:09 -06:00 • committed by Simon McVittie
parent e2bd0b1317
commit dd4e09339f
1 changed files with 11 additions and 1 deletions
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12
dbus/dbus-sysdeps-unix.c
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@ -53,6 +53,7 @@
#include <sys/stat.h>
#include <sys/wait.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <netdb.h>
#include <grp.h>
#include <arpa/inet.h>
@ -1395,7 +1396,7 @@ _dbus_listen_tcp_socket (const char *host,
tmp = ai;
while (tmp)
{
int fd = -1, *newlisten_fd;
int fd = -1, *newlisten_fd, tcp_nodelay_on;
if (!_dbus_open_socket (&fd, tmp->ai_family, SOCK_STREAM, 0, error))
{
_DBUS_ASSERT_ERROR_IS_SET(error);
@ -1410,6 +1411,15 @@ _dbus_listen_tcp_socket (const char *host,
host ? host : "*", port, _dbus_strerror (errno));
}
/* Nagle's algorithm imposes a huge delay on the initial messages
going over TCP. */
tcp_nodelay_on = 1;
if (setsockopt (fd, IPPROTO_TCP, TCP_NODELAY, &tcp_nodelay_on, sizeof (tcp_nodelay_on)) == -1)
{
_dbus_warn ("Failed to set TCP_NODELAY socket option \"%s:%s\": %s",
host ? host : "*", port, _dbus_strerror (errno));
}
if (bind (fd, (struct sockaddr*) tmp->ai_addr, tmp->ai_addrlen) < 0)
{
saved_errno = errno;