1 files changed, 4 insertions, 1 deletions
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 702d1d8dd04a..719b42907314 100644
@@ -183,7 +183,10 @@ tcp_frto - BOOLEAN
Enables F-RTO, an enhanced recovery algorithm for TCP retransmission
timeouts. It is particularly beneficial in wireless environments
where packet loss is typically due to random radio interference
- rather than intermediate router congestion.
+ rather than intermediate router congestion. If set to 1, basic
+ version is enabled. 2 enables SACK enhanced FRTO, which is
+ EXPERIMENTAL. The basic version can be used also when SACK is
+ enabled for a flow through tcp_sack sysctl.
tcp_keepalive_time - INTEGER
How often TCP sends out keepalive messages when keepalive is enabled.