1 files changed, 12 insertions, 1 deletions

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index d99940dcfc44..d3d653a5f9b9 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -187,7 +187,7 @@ tcp_cookie_size - INTEGER
 tcp_dsack - BOOLEAN
         Allows TCP to send "duplicate" SACKs.
 
-tcp_ecn - BOOLEAN
+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
@@ -280,6 +280,17 @@ tcp_max_orphans - INTEGER
         more aggressively. Let me to remind again: each orphan eats
         up to ~64K of unswappable memory.
 
+tcp_max_ssthresh - INTEGER
+        Limited Slow-Start for TCP with large congestion windows (cwnd) defined in
+        RFC3742. Limited slow-start is a mechanism to limit growth of the cwnd
+        on the region where cwnd is larger than tcp_max_ssthresh. TCP increases cwnd
+        by at most tcp_max_ssthresh segments, and by at least tcp_max_ssthresh/2
+        segments per RTT when the cwnd is above tcp_max_ssthresh.
+        If TCP connection increased cwnd to thousands (or tens of thousands) segments,
+        and thousands of packets were being dropped during slow-start, you can set
+        tcp_max_ssthresh to improve performance for new TCP connection.
+        Default: 0 (off)
+
 tcp_max_syn_backlog - INTEGER
         Maximal number of remembered connection requests, which are
         still did not receive an acknowledgment from connecting client.