diff options
| author | andre <andre@FreeBSD.org> | 2010-08-18 18:05:54 +0000 |
|---|---|---|
| committer | andre <andre@FreeBSD.org> | 2010-08-18 18:05:54 +0000 |
| commit | 26acc98c1d408fd7878e5399b58433d094b24758 (patch) | |
| tree | 49d1aa8b779fb8e531f370e3650bd2c8d1952551 /sys/netinet/tcp_var.h | |
| parent | fb7d7246f68844fc4062c081c8cab78a7a9320db (diff) | |
| download | FreeBSD-src-26acc98c1d408fd7878e5399b58433d094b24758.zip FreeBSD-src-26acc98c1d408fd7878e5399b58433d094b24758.tar.gz | |
If a TCP connection has been idle for one retransmit timeout or more
it must reset its congestion window back to the initial window.
RFC3390 has increased the initial window from 1 segment to up to
4 segments.
The initial window increase of RFC3390 wasn't reflected into the
restart window which remained at its original defaults of 4 segments
for local and 1 segment for all other connections. Both values are
controllable through sysctl net.inet.tcp.local_slowstart_flightsize
and net.inet.tcp.slowstart_flightsize.
The increase helps TCP's slow start algorithm to open up the congestion
window much faster.
Reviewed by: lstewart
MFC after: 1 week
Diffstat (limited to 'sys/netinet/tcp_var.h')
| -rw-r--r-- | sys/netinet/tcp_var.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sys/netinet/tcp_var.h b/sys/netinet/tcp_var.h index 7482277..b753e10 100644 --- a/sys/netinet/tcp_var.h +++ b/sys/netinet/tcp_var.h @@ -565,6 +565,7 @@ extern int tcp_log_in_vain; VNET_DECLARE(int, tcp_mssdflt); /* XXX */ VNET_DECLARE(int, tcp_minmss); VNET_DECLARE(int, tcp_delack_enabled); +VNET_DECLARE(int, tcp_do_rfc3390); VNET_DECLARE(int, tcp_do_newreno); VNET_DECLARE(int, path_mtu_discovery); VNET_DECLARE(int, ss_fltsz); @@ -575,6 +576,7 @@ VNET_DECLARE(int, ss_fltsz_local); #define V_tcp_mssdflt VNET(tcp_mssdflt) #define V_tcp_minmss VNET(tcp_minmss) #define V_tcp_delack_enabled VNET(tcp_delack_enabled) +#define V_tcp_do_rfc3390 VNET(tcp_do_rfc3390) #define V_tcp_do_newreno VNET(tcp_do_newreno) #define V_path_mtu_discovery VNET(path_mtu_discovery) #define V_ss_fltsz VNET(ss_fltsz) |
