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Commit 53025f5e authored by J. Bruce Fields's avatar J. Bruce Fields Committed by David S. Miller
Browse files

Documentation: clarify tcp_{r,w}mem sysctl docs 



Fix some of the defaults and attempt to clarify some language.

Signed-off-by: default avatarJ. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 2ddddb98

Documentation/networking/ip-sysctl.txt

+15 −11
Original line number Diff line number Diff line
@@ -336,7 +336,7 @@ tcp_rmem - vector of 3 INTEGERs: min, default, max 
	pressure.

	Default: 8K



	default: default size of receive buffer used by TCP sockets.

	default: initial size of receive buffer used by TCP sockets.

	This value overrides net.core.rmem_default used by other protocols.

	Default: 87380 bytes. This value results in window of 65535 with

	default setting of tcp_adv_win_scale and tcp_app_win:0 and a bit
@@ -344,8 +344,10 @@ tcp_rmem - vector of 3 INTEGERs: min, default, max 


	max: maximal size of receive buffer allowed for automatically

	selected receiver buffers for TCP socket. This value does not override

	net.core.rmem_max, "static" selection via SO_RCVBUF does not use this.

	Default: 87380*2 bytes.

	net.core.rmem_max.  Calling setsockopt() with SO_RCVBUF disables

	automatic tuning of that socket's receive buffer size, in which

	case this value is ignored.

	Default: between 87380B and 4MB, depending on RAM size.



tcp_sack - BOOLEAN

	Enable select acknowledgments (SACKS).
@@ -419,19 +421,21 @@ tcp_window_scaling - BOOLEAN 
	Enable window scaling as defined in RFC1323.



tcp_wmem - vector of 3 INTEGERs: min, default, max

	min: Amount of memory reserved for send buffers for TCP socket.

	min: Amount of memory reserved for send buffers for TCP sockets.

	Each TCP socket has rights to use it due to fact of its birth.

	Default: 4K



	default: Amount of memory allowed for send buffers for TCP socket

	by default. This value overrides net.core.wmem_default used

	by other protocols, it is usually lower than net.core.wmem_default.

	default: initial size of send buffer used by TCP sockets.  This

	value overrides net.core.wmem_default used by other protocols.

	It is usually lower than net.core.wmem_default.

	Default: 16K



	max: Maximal amount of memory allowed for automatically selected

	send buffers for TCP socket. This value does not override

	net.core.wmem_max, "static" selection via SO_SNDBUF does not use this.

	Default: 128K

	max: Maximal amount of memory allowed for automatically tuned

	send buffers for TCP sockets. This value does not override

	net.core.wmem_max.  Calling setsockopt() with SO_SNDBUF disables

	automatic tuning of that socket's send buffer size, in which case

	this value is ignored.

	Default: between 64K and 4MB, depending on RAM size.



tcp_workaround_signed_windows - BOOLEAN

	If set, assume no receipt of a window scaling option means the