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Default net.inet.tcp.experimental.initcwnd10 to 0 in releng/9.2.

Concerns have been raised regarding enabling initcwnd10 by default
in the stable/ branch, so as a cautionary measure, turn this off
for the 9.2-RELEASE.  This sysctl is still available for those
who want to enable this on their own systems.

This is a direct commit to releng/9.2.

Discussed with:	re
Approved by:	re (marius)
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gjb gjb
gjb authored and gjb committed Aug 24, 2013
1 parent ba7c29b commit f8d24f28f88f6e02c70ca4de70a8ac968061610a
Showing with 1 addition and 1 deletion.
  1. +1 −1 sys/netinet/tcp_input.c
@@ -161,7 +161,7 @@ SYSCTL_VNET_INT(_net_inet_tcp, OID_AUTO, rfc3390, CTLFLAG_RW,
SYSCTL_NODE(_net_inet_tcp, OID_AUTO, experimental, CTLFLAG_RW, 0,
"Experimental TCP extensions");
-VNET_DEFINE(int, tcp_do_initcwnd10) = 1;
+VNET_DEFINE(int, tcp_do_initcwnd10) = 0;
SYSCTL_VNET_INT(_net_inet_tcp_experimental, OID_AUTO, initcwnd10, CTLFLAG_RW,
&VNET_NAME(tcp_do_initcwnd10), 0,
"Enable draft-ietf-tcpm-initcwnd-05 (Increasing initial CWND to 10)");

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