tcp: Remove TCPCT

[mirror_ubuntu-artful-kernel.git] / Documentation / networking / ip-sysctl.txt

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index dc2dc87d2557b4fdf7537b9e8f4185965c3dd1ce..17953e2bc3e9f7bbedb10404a5fbdc4f8e326a04 100644 (file)
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -29,7 +29,7 @@ route/max_size - INTEGER
 neigh/default/gc_thresh1 - INTEGER
        Minimum number of entries to keep.  Garbage collector will not
        purge entries if there are fewer than this number.
-       Default: 256
+       Default: 128
 
 neigh/default/gc_thresh3 - INTEGER
        Maximum number of neighbor entries allowed.  Increase this
@@ -175,14 +175,6 @@ tcp_congestion_control - STRING
        is inherited.
        [see setsockopt(listenfd, SOL_TCP, TCP_CONGESTION, "name" ...) ]
 
-tcp_cookie_size - INTEGER
-       Default size of TCP Cookie Transactions (TCPCT) option, that may be
-       overridden on a per socket basis by the TCPCT socket option.
-       Values greater than the maximum (16) are interpreted as the maximum.
-       Values greater than zero and less than the minimum (8) are interpreted
-       as the minimum.  Odd values are interpreted as the next even value.
-       Default: 0 (off).
-
 tcp_dsack - BOOLEAN
        Allows TCP to send "duplicate" SACKs.
 
@@ -190,7 +182,9 @@ 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 +192,9 @@ 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.