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Commit fab42760 authored by Fan Du's avatar Fan Du Committed by David S. Miller
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ipv4: Documenting two sysctls for tcp PMTU probe 



Namely tcp_probe_interval to control how often to restart
a probe. And tcp_probe_threshold to control when stop the
probing in respect to the width of search range in bytes

Signed-off-by: default avatarFan Du <fan.du@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 05cbc0db

Documentation/networking/ip-sysctl.txt

+10 −0
Original line number Diff line number Diff line
@@ -388,6 +388,16 @@ tcp_mtu_probing - INTEGER 
	  1 - Disabled by default, enabled when an ICMP black hole detected

	  2 - Always enabled, use initial MSS of tcp_base_mss.



tcp_probe_interval - INTEGER

	Controls how often to start TCP Packetization-Layer Path MTU

	Discovery reprobe. The default is reprobing every 10 minutes as

	per RFC4821.



tcp_probe_threshold - INTEGER

	Controls when TCP Packetization-Layer Path MTU Discovery probing

	will stop in respect to the width of search range in bytes. Default

	is 8 bytes.



tcp_no_metrics_save - BOOLEAN

	By default, TCP saves various connection metrics in the route cache

	when the connection closes, so that connections established in the