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-rw-r--r--Documentation/networking/ip-sysctl.txt11
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index ac3b4a726a1..d3d653a5f9b 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -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.