Author: andre Date: Thu Sep 16 22:11:55 2010 New Revision: 212769 URL: http://svn.freebsd.org/changeset/base/212769
Log: The inflight bandwidth limiter was removed in r212765. Modified: head/share/man/man4/tcp.4 Modified: head/share/man/man4/tcp.4 ============================================================================== --- head/share/man/man4/tcp.4 Thu Sep 16 21:18:25 2010 (r212768) +++ head/share/man/man4/tcp.4 Thu Sep 16 22:11:55 2010 (r212769) @@ -32,7 +32,7 @@ .\" From: @(#)tcp.4 8.1 (Berkeley) 6/5/93 .\" $FreeBSD$ .\" -.Dd August 16, 2008 +.Dd September 16, 2010 .Dt TCP 4 .Os .Sh NAME @@ -383,72 +383,6 @@ code. For this reason, we use 200ms of slop and a near-0 minimum, which gives us an effective minimum of 200ms (similar to .Tn Linux ) . -.It Va inflight.enable -Enable -.Tn TCP -bandwidth-delay product limiting. -An attempt will be made to calculate -the bandwidth-delay product for each individual -.Tn TCP -connection, and limit -the amount of inflight data being transmitted, to avoid building up -unnecessary packets in the network. -This option is recommended if you -are serving a lot of data over connections with high bandwidth-delay -products, such as modems, GigE links, and fast long-haul WANs, and/or -you have configured your machine to accommodate large -.Tn TCP -windows. -In such -situations, without this option, you may experience high interactive -latencies or packet loss due to the overloading of intermediate routers -and switches. -Note that bandwidth-delay product limiting only effects -the transmit side of a -.Tn TCP -connection. -.It Va inflight.debug -Enable debugging for the bandwidth-delay product algorithm. -.It Va inflight.min -This puts a lower bound on the bandwidth-delay product window, in bytes. -A value of 1024 is typically used for debugging. -6000-16000 is more typical in a production installation. -Setting this value too low may result in -slow ramp-up times for bursty connections. -Setting this value too high effectively disables the algorithm. -.It Va inflight.max -This puts an upper bound on the bandwidth-delay product window, in bytes. -This value should not generally be modified, but may be used to set a -global per-connection limit on queued data, potentially allowing you to -intentionally set a less than optimum limit, to smooth data flow over a -network while still being able to specify huge internal -.Tn TCP -buffers. -.It Va inflight.stab -The bandwidth-delay product algorithm requires a slightly larger window -than it otherwise calculates for stability. -This parameter determines the extra window in maximal packets / 10. -The default value of 20 represents 2 maximal packets. -Reducing this value is not recommended, but you may -come across a situation with very slow links where the -.Xr ping 8 -time -reduction of the default inflight code is not sufficient. -If this case occurs, you should first try reducing -.Va inflight.min -and, if that does not -work, reduce both -.Va inflight.min -and -.Va inflight.stab , -trying values of -15, 10, or 5 for the latter. -Never use a value less than 5. -Reducing -.Va inflight.stab -can lead to upwards of a 20% underutilization of the link -as well as reducing the algorithm's ability to adapt to changing -situations and should only be done as a last resort. .It Va rfc3042 Enable the Limited Transmit algorithm as described in RFC 3042. It helps avoid timeouts on lossy links and also when the congestion window _______________________________________________ svn-src-head@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
