diff options
| author | andre <andre@FreeBSD.org> | 2006-02-16 19:38:07 +0000 |
|---|---|---|
| committer | andre <andre@FreeBSD.org> | 2006-02-16 19:38:07 +0000 |
| commit | e83c574f873ca62a647c1d708a65c507c50a3b52 (patch) | |
| tree | 50085f7cd5f6a0c2d314a7e5e7a2100f076b6b44 /sys/netinet/tcp_timer.h | |
| parent | ae2214aeaef3707cbd8f1f7a2791b518a8ccef30 (diff) | |
| download | FreeBSD-src-e83c574f873ca62a647c1d708a65c507c50a3b52.zip FreeBSD-src-e83c574f873ca62a647c1d708a65c507c50a3b52.tar.gz | |
Have TCP Inflight disable itself if the RTT is below a certain
threshold. Inflight doesn't make sense on a LAN as it has
trouble figuring out the maximal bandwidth because of the coarse
tick granularity.
The sysctl net.inet.tcp.inflight.rttthresh specifies the threshold
in milliseconds below which inflight will disengage. It defaults
to 10ms.
Tested by: Joao Barros <joao.barros-at-gmail.com>,
Rich Murphey <rich-at-whiteoaklabs.com>
Sponsored by: TCP/IP Optimization Fundraise 2005
Diffstat (limited to 'sys/netinet/tcp_timer.h')
| -rw-r--r-- | sys/netinet/tcp_timer.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/sys/netinet/tcp_timer.h b/sys/netinet/tcp_timer.h index c62060f..d3d7c94 100644 --- a/sys/netinet/tcp_timer.h +++ b/sys/netinet/tcp_timer.h @@ -86,6 +86,9 @@ #define TCPTV_KEEPINTVL ( 75*hz) /* default probe interval */ #define TCPTV_KEEPCNT 8 /* max probes before drop */ +#define TCPTV_INFLIGHT_RTTTHRESH (10*hz/1000) /* below which inflight + disengages, in msec */ + /* * Minimum retransmit timer is 3 ticks, for algorithmic stability. * TCPT_RANGESET() will add another TCPTV_CPU_VAR to deal with |
