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tcp.7: Update tcp_frto description for 2.6.22 changes 

Linux 2.6.22 added a mode value 2 ("Enable SACK-enhanced
F-RTO if flow uses SACK").

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2008-11-21 16:00:09 -05:00
parent c833891e41
commit a93868fd3b
1 changed files with 17 additions and 1 deletions
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18
man7/tcp.7
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@ -352,7 +352,7 @@ In Linux 2.2, the default value was 180.
.\"
.\" The following is from 2.6.12: Documentation/networking/ip-sysctl.txt
.TP
.IR tcp_frto " (Boolean; default: disabled; since Linux 2.4.21/2.6)"
.IR tcp_frto " (integer; default: 0; since Linux 2.4.21/2.6)"
.\" Since 2.4.21/2.5.43
Enables F-RTO, an enhanced recovery algorithm for TCP retransmission
timeouts (RTOs).
@ -360,6 +360,22 @@ It is particularly beneficial in wireless environments
where packet loss is typically due to random radio interference
rather than intermediate router congestion.
See RFC 4138 for more details.
This file can have one of the following values:
.RS
.IP 0 3
Disabled.
.IP 1
The basic version F-RTO algorithm is enabled.
.IP 2
Enable SACK-enhanced F-RTO if flow uses SACK.
The basic version can be used also when
SACK is in use though in that case scenario(s) exists where F-RTO
interacts badly with the packet counting of the SACK-enabled TCP flow.
.RE
.IP
Before Linux 2.6.22, this parameter was a Boolean value,
supporting just values 0 and 1 above.
.TP
.IR tcp_frto_response " (integer; default: 0; since Linux 2.6.22)"
When F-RTO has detected that a TCP retransmission timeout was spurious