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-rw-r--r--Documentation/networking/ip-sysctl.txt17
1 files changed, 12 insertions, 5 deletions
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 32c2e9da5f3a..6ae2feff3087 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -180,13 +180,20 @@ tcp_fin_timeout - INTEGER
180 to live longer. Cf. tcp_max_orphans. 180 to live longer. Cf. tcp_max_orphans.
181 181
182tcp_frto - INTEGER 182tcp_frto - INTEGER
183 Enables F-RTO, an enhanced recovery algorithm for TCP retransmission 183 Enables Forward RTO-Recovery (F-RTO) defined in RFC4138.
184 F-RTO is an enhanced recovery algorithm for TCP retransmission
184 timeouts. It is particularly beneficial in wireless environments 185 timeouts. It is particularly beneficial in wireless environments
185 where packet loss is typically due to random radio interference 186 where packet loss is typically due to random radio interference
186 rather than intermediate router congestion. If set to 1, basic 187 rather than intermediate router congestion. FRTO is sender-side
187 version is enabled. 2 enables SACK enhanced F-RTO, which is 188 only modification. Therefore it does not require any support from
188 EXPERIMENTAL. The basic version can be used also when SACK is 189 the peer, but in a typical case, however, where wireless link is
189 enabled for a flow through tcp_sack sysctl. 190 the local access link and most of the data flows downlink, the
191 faraway servers should have FRTO enabled to take advantage of it.
192 If set to 1, basic version is enabled. 2 enables SACK enhanced
193 F-RTO if flow uses SACK. The basic version can be used also when
194 SACK is in use though scenario(s) with it exists where FRTO
195 interacts badly with the packet counting of the SACK enabled TCP
196 flow.
190 197
191tcp_frto_response - INTEGER 198tcp_frto_response - INTEGER
192 When F-RTO has detected that a TCP retransmission timeout was 199 When F-RTO has detected that a TCP retransmission timeout was