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tcp: document tcp_max_ssthresh (Limited Slow-Start)

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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: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: Shan Wei <shanwei@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ilpo Järvinen 2011-02-19 21:52:41 +00:00 committed by David S. Miller
parent da935c66ba
commit 81146ec1b8
1 changed files with 11 additions and 0 deletions
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11
Documentation/networking/ip-sysctl.txt
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@ -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.