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-rw-r--r--Documentation/networking/ip-sysctl.txt9
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 5095c63e50ed..cb083e0d682c 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -267,6 +267,15 @@ tcp_ecn - INTEGER
but do not request ECN on outgoing connections.
Default: 2
+tcp_ecn_fallback - BOOLEAN
+ If the kernel detects that ECN connection misbehaves, enable fall
+ back to non-ECN. Currently, this knob implements the fallback
+ from RFC3168, section 6.1.1.1., but we reserve that in future,
+ additional detection mechanisms could be implemented under this
+ knob. The value is not used, if tcp_ecn or per route (or congestion
+ control) ECN settings are disabled.
+ Default: 1 (fallback enabled)
+
tcp_fack - BOOLEAN
Enable FACK congestion avoidance and fast retransmission.
The value is not used, if tcp_sack is not enabled.