]> pilppa.com Git - linux-2.6-omap-h63xx.git/commit
[TCP]: SACK enhanced FRTO
authorIlpo Järvinen <ilpo.jarvinen@helsinki.fi>
Thu, 22 Feb 2007 07:16:11 +0000 (23:16 -0800)
committerDavid S. Miller <davem@sunset.davemloft.net>
Thu, 26 Apr 2007 05:23:16 +0000 (22:23 -0700)
commit4dc2665e3634d720a62bd27128fc8781fcdad2dc
tree6829101a6eeadb446e45b4a825f148988332d84b
parent288035f915686a9a9e85e0358c5392bb5d7ae58d
[TCP]: SACK enhanced FRTO

Implements the SACK-enhanced FRTO given in RFC4138 using the
variant given in Appendix B.

RFC4138, Appendix B:
  "This means that in order to declare timeout spurious, the TCP
   sender must receive an acknowledgment for non-retransmitted
   segment between SND.UNA and RecoveryPoint in algorithm step 3.
   RecoveryPoint is defined in conservative SACK-recovery
   algorithm [RFC3517]"

The basic version of the FRTO algorithm can still be used also
when SACK is enabled. To enabled SACK-enhanced version, tcp_frto
sysctl is set to 2.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv4/tcp_input.c