Date: Sun, 15 Aug 2010 15:29:48 +0200 From: Andre Oppermann <andre@freebsd.org> To: freebsd-net@freebsd.org Subject: TCP inflight limiter disabled and scheduled for removal Message-ID: <4C67EBCC.7000507@freebsd.org>
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FYI the TCP inflight limiter is now disabled by default and will be removed soon. It was interfering with the congestion control algorithms and the upcoming pluggable congestion control framework allows other approaches to be selected at runtime. -------- Original Message -------- Subject: svn commit: r211315 - head/sys/netinet Date: Sat, 14 Aug 2010 20:40:55 +0000 (UTC) From: Andre Oppermann <andre@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Author: andre Date: Sat Aug 14 20:40:55 2010 New Revision: 211315 URL: http://svn.freebsd.org/changeset/base/211315 Log: 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 interference. Reviewed by: lstewart MFC after: 1 week Removal after: 1 month Modified: head/sys/netinet/tcp_subr.c 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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