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-rw-r--r--Documentation/networking/ip-sysctl.txt8
1 files changed, 6 insertions, 2 deletions
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index dc2dc87d2557..1cae6c383e1b 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -190,7 +190,9 @@ tcp_early_retrans - INTEGER
Enable Early Retransmit (ER), per RFC 5827. ER lowers the threshold
for triggering fast retransmit when the amount of outstanding data is
small and when no previously unsent data can be transmitted (such
- that limited transmit could be used).
+ that limited transmit could be used). Also controls the use of
+ Tail loss probe (TLP) that converts RTOs occuring due to tail
+ losses into fast recovery (draft-dukkipati-tcpm-tcp-loss-probe-01).
Possible values:
0 disables ER
1 enables ER
@@ -198,7 +200,9 @@ tcp_early_retrans - INTEGER
by a fourth of RTT. This mitigates connection falsely
recovers when network has a small degree of reordering
(less than 3 packets).
- Default: 2
+ 3 enables delayed ER and TLP.
+ 4 enables TLP only.
+ Default: 3
tcp_ecn - INTEGER
Control use of Explicit Congestion Notification (ECN) by TCP.