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Document the net.inet.tcp.rfc3390 sysctl variable.

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hsu 2003-03-13 01:44:58 +00:00
parent 896f13eb8e
commit ba71de6a3b
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share/man/man4/tcp.4
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@ -365,8 +365,22 @@ as well as reducing the algorithm's ability to adapt to changing
situations and should only be done as a last resort.
.It tcp.rfc3042
Enable the Limited Transmit algorithm as described in RFC 3042. It
helps avoid timeouts on lossy links. This is a standards track RFC
helps avoid timeouts on lossy links and also when the congestion window
is small, as happens on short transfers. This is a standards track RFC
and is off by default.
.It tcp.rfc3390
Enable support for RFC 3390, which allows for a variable-sized
starting congestion window on new connections, depending on the
maximum segment size. This helps throughput in general, but
particularly affects short transfers and high-bandwidth large
propagation-delay connections. This is a standards track RFC and
support for it is off by default.
.Pp
When this feature is enabled, the slowstart_flightsize and
local_slowstart_flightsize settings are not observed for new
connection slow starts, but they are still used for slow starts
that occur when the connection has been idle and starts sending
again.
.El
.Sh ERRORS
A socket operation may fail with one of the following errors returned: