From 33ab07a6dd30e246e1191f181ca4bcdafb8001a2 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= Date: Thu, 20 Sep 2007 11:35:26 -0700 Subject: [PATCH] --- yaml --- r: 66679 b: refs/heads/master c: cd99889c616afe1e8addcf28da505600c04f065a h: refs/heads/master i: 66677: 288f302d8afbd14c70cb009cff1985fb1f5a1a79 66675: 75b435840207996d487e047e4df5e0205fd0e8dc 66671: fac79d9f6ce54225d9d11f458a09c83073f1594c v: v3 --- [refs] | 2 +- trunk/Documentation/networking/ip-sysctl.txt | 17 ++++++++++++----- 2 files changed, 13 insertions(+), 6 deletions(-) diff --git a/[refs] b/[refs] index e205df0bce54..79a918e261fc 100644 --- a/[refs] +++ b/[refs] @@ -1,2 +1,2 @@ --- -refs/heads/master: 009a2e3e4ec395a290b9e4c7c9ff99296fd6b7d8 +refs/heads/master: cd99889c616afe1e8addcf28da505600c04f065a diff --git a/trunk/Documentation/networking/ip-sysctl.txt b/trunk/Documentation/networking/ip-sysctl.txt index 32c2e9da5f3a..6ae2feff3087 100644 --- a/trunk/Documentation/networking/ip-sysctl.txt +++ b/trunk/Documentation/networking/ip-sysctl.txt @@ -180,13 +180,20 @@ tcp_fin_timeout - INTEGER to live longer. Cf. tcp_max_orphans. tcp_frto - INTEGER - Enables F-RTO, an enhanced recovery algorithm for TCP retransmission + Enables Forward RTO-Recovery (F-RTO) defined in RFC4138. + F-RTO is 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. If set to 1, basic - version is enabled. 2 enables SACK enhanced F-RTO, which is - EXPERIMENTAL. The basic version can be used also when SACK is - enabled for a flow through tcp_sack sysctl. + rather than intermediate router congestion. FRTO is sender-side + only modification. Therefore it does not require any support from + the peer, but in a typical case, however, where wireless link is + the local access link and most of the data flows downlink, the + faraway servers should have FRTO enabled to take advantage of it. + If set to 1, basic version is enabled. 2 enables SACK enhanced + F-RTO if flow uses SACK. The basic version can be used also when + SACK is in use though scenario(s) with it exists where FRTO + interacts badly with the packet counting of the SACK enabled TCP + flow. tcp_frto_response - INTEGER When F-RTO has detected that a TCP retransmission timeout was