Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit cd99889c authored by Ilpo Järvinen's avatar Ilpo Järvinen Committed by David S. Miller
Browse files

[TCP] FRTO: Update sysctl documentation 



Since the SACK enhanced FRTO was added, the code has been
under test numerous times so remove "experimental" claim
from the documentation. Also be a bit more verbose about
the usage.

Signed-off-by: default avatarIlpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 009a2e3e

Documentation/networking/ip-sysctl.txt

+12 −5
Original line number Diff line number Diff line
@@ -180,13 +180,20 @@ tcp_fin_timeout - INTEGER 
	to live longer.	Cf. tcp_max_orphans.



tcp_frto - INTEGER

	Enables F-RTO, an enhanced recovery algorithm for TCP retransmission

	Enables Forward RTO-Recovery (F-RTO) defined in RFC4138.

	F-RTO is an enhanced recovery algorithm for TCP retransmission

	timeouts.  It is particularly beneficial in wireless environments

	where packet loss is typically due to random radio interference

	rather than intermediate router congestion. If set to 1, basic

	version is enabled. 2 enables SACK enhanced F-RTO, which is

	EXPERIMENTAL. The basic version can be used also when SACK is

	enabled for a flow through tcp_sack sysctl.

	rather than intermediate router congestion.  FRTO is sender-side

	only modification.  Therefore it does not require any support from

	the peer, but in a typical case, however, where wireless link is

	the local access link and most of the data flows downlink, the

	faraway servers should have FRTO enabled to take advantage of it.

	If set to 1, basic version is enabled.  2 enables SACK enhanced

	F-RTO if flow uses SACK.  The basic version can be used also when

	SACK is in use though scenario(s) with it exists where FRTO

	interacts badly with the packet counting of the SACK enabled TCP

	flow.



tcp_frto_response - INTEGER

	When F-RTO has detected that a TCP retransmission timeout was