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[TCP]: cubic update for net-2.6.22

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The following update received from Injong updates TCP cubic to the latest
version. I am running more complete tests and will have results after 4/1.

According to Injong: the new version improves on its scalability,
fairness and stability.  So in all properties, we confirmed it shows better
performance.

NCSU results (for 2.6.18 and 2.6.20) available:
	http://netsrv.csc.ncsu.edu/wiki/index.php/TCP_Testing

This version is described in a new Internet draft for CUBIC.
	http://www.ietf.org/internet-drafts/draft-rhee-tcp-cubic-00.txt

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2007-03-24 21:34:38 -07:00 committed by David S. Miller
parent 9af3912ec9
commit e1c3e7ab6d
1 changed files with 5 additions and 3 deletions
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8
net/ipv4/tcp_cubic.c
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@ -1,5 +1,5 @@
/*
* TCP CUBIC: Binary Increase Congestion control for TCP v2.0
* TCP CUBIC: Binary Increase Congestion control for TCP v2.1
*
* This is from the implementation of CUBIC TCP in
* Injong Rhee, Lisong Xu.
@ -214,7 +214,9 @@ static inline void bictcp_update(struct bictcp *ca, u32 cwnd)
if (ca->delay_min > 0) {
/* max increment = Smax * rtt / 0.1 */
min_cnt = (cwnd * HZ * 8)/(10 * max_increment * ca->delay_min);
if (ca->cnt < min_cnt)
/* use concave growth when the target is above the origin */
if (ca->cnt < min_cnt && t >= ca->bic_K)
ca->cnt = min_cnt;
}
@ -400,4 +402,4 @@ module_exit(cubictcp_unregister);
MODULE_AUTHOR("Sangtae Ha, Stephen Hemminger");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("CUBIC TCP");
MODULE_VERSION("2.0");
MODULE_VERSION("2.1");