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Commit 71599cd1 authored by John Heffner's avatar John Heffner Committed by David S. Miller
Browse files

[TCP]: Document several sysctls. 



This adds documentation for tcp_moderate_rcvbuf, tcp_no_metrics_save,
tcp_base_mss, and tcp_mtu_probing.

Signed-off-by: default avatarJohn Heffner <jheffner@psc.edu>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b08d5840

Documentation/networking/ip-sysctl.txt

+26 −0
Original line number Diff line number Diff line
@@ -147,6 +147,11 @@ tcp_available_congestion_control - STRING 
	More congestion control algorithms may be available as modules,

	but not loaded.



tcp_base_mss - INTEGER

	The initial value of search_low to be used by Packetization Layer

	Path MTU Discovery (MTU probing).  If MTU probing is enabled,

	this is the inital MSS used by the connection.



tcp_congestion_control - STRING

	Set the congestion control algorithm to be used for new

	connections. The algorithm "reno" is always available, but
@@ -243,6 +248,27 @@ tcp_mem - vector of 3 INTEGERs: min, pressure, max 
	Defaults are calculated at boot time from amount of available

	memory.



tcp_moderate_rcvbuf - BOOLEAN

	If set, TCP performs receive buffer autotuning, attempting to

	automatically size the buffer (no greater than tcp_rmem[2]) to

	match the size required by the path for full throughput.  Enabled by

	default.



tcp_mtu_probing - INTEGER

	Controls TCP Packetization-Layer Path MTU Discovery.  Takes three

	values:

	  0 - Disabled

	  1 - Disabled by default, enabled when an ICMP black hole detected

	  2 - Always enabled, use initial MSS of tcp_base_mss.



tcp_no_metrics_save - BOOLEAN

	By default, TCP saves various connection metrics in the route cache

	when the connection closes, so that connections established in the

	near future can use these to set initial conditions.  Usually, this

	increases overall performance, but may sometimes cause performance

	degredation.  If set, TCP will not cache metrics on closing

	connections.



tcp_orphan_retries - INTEGER

	How may times to retry before killing TCP connection, closed

	by our side. Default value 7 corresponds to ~50sec-16min