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tcp.7: Document /proc file tcp_mtu_probing (new in Linux 2.6.17) 

Text taken from Documentation/networking/ip-sysctl.txt

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2008-11-20 17:04:39 -05:00
parent 98eaadb06b
commit 650d7ce060
1 changed files with 15 additions and 2 deletions
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man7/tcp.7
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@ -435,14 +435,27 @@ will allocate.
This value overrides any other limits
imposed by the kernel.
.TP
.IR tcp_mtu_probing " (integer; default: 0; since Linux 2.6.17)"
.\" The following is from 2.6.28-rc4: Documentation/networking/ip-sysctl.txt
This parameter controls TCP Packetization-Layer Path MTU Discovery.
The following values may be assigned to the file:
.RS
.IP 0 3
Disabled
.IP 1
Disabled by default, enabled when an ICMP black hole detected
.IP 2
Always enabled, use initial MSS of
.IR tcp_base_mss .
.RE
.TP
.IR tcp_no_metrics_save " (Boolean; default: disabled; since Linux 2.6.6)"
.\" The following is from 2.6.28-rc4: Documentation/networking/ip-sysctl.txt
By default, TCP saves various connection metrics in the route cache
when the connection closes, so that connections established in the
near future can use these to set initial conditions.
Usually, this increases overall performance,
but it may sometimes cause performance
degradation.
but it may sometimes cause performance degradation.
If
.I tcp_no_metrics_save
is enabled, TCP will not cache metrics on closing connections.