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authorRick Jones <rick.jones2@hp.com>2012-11-28 09:53:10 +0000
committerDavid S. Miller <davem@davemloft.net>2012-11-29 13:14:58 -0500
commit7e3a2dc52953f126103a36b33db1f57463fbbb8f (patch)
tree5b11709ddc3c40bfe23a44ec4c7ea434a0441208 /Documentation/networking
parent8a2cf062b27ef5511a7d8a7ce6662fbc04f671b8 (diff)
doc: make the description of how tcp_ecn works more explicit and clear
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>
Diffstat (limited to 'Documentation/networking')
-rw-r--r--Documentation/networking/ip-sysctl.txt17
1 files changed, 9 insertions, 8 deletions
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 98ac0d7552a1..c6d5fee888c4 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -199,15 +199,16 @@ tcp_early_retrans - INTEGER
Default: 2
tcp_ecn - INTEGER
- Enable Explicit Congestion Notification (ECN) in TCP. ECN is only
- used when both ends of the TCP flow support it. It is useful to
- avoid losses due to congestion (when the bottleneck router supports
- ECN).
+ Control use of Explicit Congestion Notification (ECN) by TCP.
+ ECN is used only when both ends of the TCP connection indicate
+ support for it. This feature is useful in avoiding losses due
+ to congestion by allowing supporting routers to signal
+ congestion before having to drop packets.
Possible values are:
- 0 disable ECN
- 1 ECN enabled
- 2 Only server-side ECN enabled. If the other end does
- not support ECN, behavior is like with ECN disabled.
+ 0 Disable ECN. Neither initiate nor accept ECN.
+ 1 Always request ECN on outgoing connection attempts.
+ 2 Enable ECN when requested by incomming connections
+ but do not request ECN on outgoing connections.
Default: 2
tcp_fack - BOOLEAN