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

	pressure.

	Default: 8K

	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.

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

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

	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

	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

	max: maximal size of receive buffer allowed for automatically

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

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

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

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

	Default: 87380*2 bytes.

	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

tcp_sack - BOOLEAN

	Enable select acknowledgments (SACKS).

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

	Enable window scaling as defined in RFC1323.





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

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.

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

	Default: 4K

	Default: 4K





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

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

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

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

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

	It is usually lower than net.core.wmem_default.

	Default: 16K

	Default: 16K





	max: Maximal amount of memory allowed for automatically selected

	max: Maximal amount of memory allowed for automatically tuned

	send buffers for TCP socket. This value does not override

	send buffers for TCP sockets. This value does not override

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

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

	Default: 128K

	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

tcp_workaround_signed_windows - BOOLEAN

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

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