[TCP]: Document several sysctls. (71599cd1) · Commits · 戴 / test

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

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