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Add a description for the TCP sysctl variable rfc6675_pipe.

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It was introduced by r290122, but no documentation was provided.
This is taken from https://reviews.freebsd.org/D21798, since it
is not related to the feature added there.

Submitted by:		Richard Scheffenegger
MFC after:		1 week
This commit is contained in:
Michael Tuexen 2019-12-01 19:20:28 +00:00
parent 8df12ffcc2
commit f09a6a3538
1 changed files with 4 additions and 1 deletions
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5
share/man/man4/tcp.4
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@ -34,7 +34,7 @@
.\" From: @(#)tcp.4 8.1 (Berkeley) 6/5/93
.\" $FreeBSD$
.\"
.Dd August 26, 2019
.Dd December 1, 2019
.Dt TCP 4
.Os
.Sh NAME
@ -538,6 +538,9 @@ The value should be relative to the link capacity.
Start with small values for lower-capacity links.
Large bursts can cause buffer overruns and packet drops if routers have small
buffers or the link is experiencing congestion.
.It Va rfc6675_pipe
Calculate the bytes in flight using the algorithm described in RFC 6675, and
is also a prerequisite to enable Proportional Rate Reduction.
.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