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doc: make the description of how tcp_ecn works more explicit and clear

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Make the description of how tcp_ecn works a bit more explicit and clear.

Signed-off-by: Rick Jones <rick.jones2@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Rick Jones 2012-11-28 09:53:10 +00:00 committed by David S. Miller
parent 8a2cf062b2
commit 7e3a2dc529
1 changed files with 9 additions and 8 deletions
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17
Documentation/networking/ip-sysctl.txt
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@ -199,15 +199,16 @@ tcp_early_retrans - INTEGER
Default: 2 Default: 2
tcp_ecn - INTEGER tcp_ecn - INTEGER
Enable Explicit Congestion Notification (ECN) in TCP. ECN is only Control use of Explicit Congestion Notification (ECN) by TCP.
used when both ends of the TCP flow support it. It is useful to ECN is used only when both ends of the TCP connection indicate
avoid losses due to congestion (when the bottleneck router supports support for it. This feature is useful in avoiding losses due
ECN). to congestion by allowing supporting routers to signal
congestion before having to drop packets.
Possible values are: Possible values are:
0 disable ECN 0 Disable ECN. Neither initiate nor accept ECN.
1 ECN enabled 1 Always request ECN on outgoing connection attempts.
2 Only server-side ECN enabled. If the other end does 2 Enable ECN when requested by incomming connections
not support ECN, behavior is like with ECN disabled. but do not request ECN on outgoing connections.
Default: 2 Default: 2
tcp_fack - BOOLEAN tcp_fack - BOOLEAN