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Commit 81146ec1 authored by Ilpo Järvinen's avatar Ilpo Järvinen Committed by David S. Miller
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tcp: document tcp_max_ssthresh (Limited Slow-Start) 

Base on Ilpo's patch about documenting tcp_max_ssthresh.
(see http://marc.info/?l=linux-netdev&m=117950581307310&w=2

)

According to errata of RFC3742, fix the number of segments increased
during RTT time.

Just to state the occasion to use this parameter, But
about how to set parameter value, maybe some others can do it.

Signed-off-by: default avatarIlpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: default avatarShan Wei <shanwei@cn.fujitsu.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent da935c66

Documentation/networking/ip-sysctl.txt

+11 −0
Original line number Diff line number Diff line
@@ -280,6 +280,17 @@ tcp_max_orphans - INTEGER 
	more aggressively. Let me to remind again: each orphan eats

	up to ~64K of unswappable memory.



tcp_max_ssthresh - INTEGER

	Limited Slow-Start for TCP with large congestion windows (cwnd) defined in

	RFC3742. Limited slow-start is a mechanism to limit growth of the cwnd

	on the region where cwnd is larger than tcp_max_ssthresh. TCP increases cwnd

	by at most tcp_max_ssthresh segments, and by at least tcp_max_ssthresh/2

	segments per RTT when the cwnd is above tcp_max_ssthresh.

	If TCP connection increased cwnd to thousands (or tens of thousands) segments,

	and thousands of packets were being dropped during slow-start, you can set

	tcp_max_ssthresh to improve performance for new TCP connection.

	Default: 0 (off)



tcp_max_syn_backlog - INTEGER

	Maximal number of remembered connection requests, which are

	still did not receive an acknowledgment from connecting client.