git: tcp: Lowering initial RTO according to RFC 6298

[Sepherosa Ziehau <sephe@xxxxxxxxxxxxxxxxxxxxxxx>]

commit 48a4676d0b815f0b3c9dcc0ab98a2e100b4383b9
Author: Sepherosa Ziehau <sephe@dragonflybsd.org>
Date:   Fri Mar 16 18:23:47 2012 +0800

    tcp: Lowering initial RTO according to RFC 6298
    
    The SYN retransmit backoff is roughly according to the tcp_syn_backoff[]
    as following:
                                          15s
    tcp_syn_backoff[]     rexmt: 3 3 3 3 3 | 6 12 24 (ended at 57s)
    tcp_syn_backoff_low[] rexmt: 1 2 4 4 4 | 8 16 16 (ended at 55s)
    
    It is on by default and could be turned off by using sysctl
    net.inet.tcp.low_rtobase

Summary of changes:
 sys/netinet/tcp_input.c |   10 ++++++++++
 sys/netinet/tcp_subr.c  |    4 ++++
 sys/netinet/tcp_timer.c |   16 +++++++++++++---
 sys/netinet/tcp_timer.h |    6 +++++-
 sys/netinet/tcp_var.h   |    1 +
 5 files changed, 33 insertions(+), 4 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/48a4676d0b815f0b3c9dcc0ab98a2e100b4383b9


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