svn commit: r211315 - head/sys/netinet

Andre Oppermann andre at
Sat Aug 14 20:40:55 UTC 2010

Author: andre
Date: Sat Aug 14 20:40:55 2010
New Revision: 211315

  Disable TCP inflight limiter by default.
  It was experimental and interferes with the normal congestion control
  algorithms by instating a separate, possibly lower, ceiling for the
  amount of data that is in flight to the remote host.  With high speed
  internet connections the inflight limit frequently has been estimated
  too low due to the noisy nature of the RTT measurements.
  This code gives way for the upcoming pluggable congestion control
  framework.  It is the task of the congestion control algorithm to
  set the congestion window and amount of inflight data without external
  Reviewed by:	lstewart
  MFC after:	1 week
  Removal after:	1 month


Modified: head/sys/netinet/tcp_subr.c
--- head/sys/netinet/tcp_subr.c	Sat Aug 14 20:12:10 2010	(r211314)
+++ head/sys/netinet/tcp_subr.c	Sat Aug 14 20:40:55 2010	(r211315)
@@ -221,7 +221,7 @@ SYSCTL_VNET_INT(_net_inet_tcp, OID_AUTO,
 SYSCTL_NODE(_net_inet_tcp, OID_AUTO, inflight, CTLFLAG_RW, 0,
     "TCP inflight data limiting");
-static VNET_DEFINE(int, tcp_inflight_enable) = 1;
+static VNET_DEFINE(int, tcp_inflight_enable) = 0;
 #define	V_tcp_inflight_enable		VNET(tcp_inflight_enable)
 SYSCTL_VNET_INT(_net_inet_tcp_inflight, OID_AUTO, enable, CTLFLAG_RW,
     &VNET_NAME(tcp_inflight_enable), 0,

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