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| author | Rick Jones <rick.jones2@hp.com> | 2012-11-28 09:53:10 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-11-29 13:14:58 -0500 |
| commit | 7e3a2dc52953f126103a36b33db1f57463fbbb8f (patch) | |
| tree | 5b11709ddc3c40bfe23a44ec4c7ea434a0441208 /Documentation/networking/ip-sysctl.txt | |
| parent | 8a2cf062b27ef5511a7d8a7ce6662fbc04f671b8 (diff) | |
| download | lwn-7e3a2dc52953f126103a36b33db1f57463fbbb8f.tar.gz lwn-7e3a2dc52953f126103a36b33db1f57463fbbb8f.zip | |
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/ip-sysctl.txt')
| -rw-r--r-- | Documentation/networking/ip-sysctl.txt | 17 |
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 |