Commit 19f92a03 authored Oct 30, 2019 by Eric Dumazet Committed by David S. Miller Oct 31, 2019

net: increase SOMAXCONN to 4096



SOMAXCONN is /proc/sys/net/core/somaxconn default value.

It has been defined as 128 more than 20 years ago.

Since it caps the listen() backlog values, the very small value has
caused numerous problems over the years, and many people had
to raise it on their hosts after beeing hit by problems.

Google has been using 1024 for at least 15 years, and we increased
this to 4096 after TCP listener rework has been completed, more than
4 years ago. We got no complain of this change breaking any
legacy application.

Many applications indeed setup a TCP listener with listen(fd, -1);
meaning they let the system select the backlog.

Raising SOMAXCONN lowers chance of the port being unavailable under
even small SYNFLOOD attack, and reduces possibilities of side channel
vulnerabilities.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Willy Tarreau <w@1wt.eu>
Cc: Yue Cao <ycao009@ucr.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 6d6f0383

Documentation/networking/ip-sysctl.txt

+2 −2

Original line number	Diff line number	Diff line
		@@ -207,8 +207,8 @@ TCP variables:

		somaxconn - INTEGER
		Limit of socket listen() backlog, known in userspace as SOMAXCONN.
		Defaults to 128. See also tcp_max_syn_backlog for additional tuning
		for TCP sockets.
		Defaults to 4096. (Was 128 before linux-5.4)
		See also tcp_max_syn_backlog for additional tuning for TCP sockets.

		tcp_abort_on_overflow - BOOLEAN
		If listening service is too slow to accept new connections,

include/linux/socket.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -263,7 +263,7 @@ struct ucred {
		#define PF_MAX AF_MAX

		/* Maximum queue length specifiable by listen. */
		#define SOMAXCONN 128
		#define SOMAXCONN 4096

		/* Flags we can use with send/ and recv.
		Added those for 1003.1g not all are supported yet

Admin message