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authorStephen Hemminger <shemminger@linux-foundation.org>2007-03-24 21:34:38 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-04-25 22:28:09 -0700
commite1c3e7ab6de9711d2e0e9daf369c6638582eb7e7 (patch)
tree2df5485e75fb622b0f587bf0c7273c83f0d66e62
parent9af3912ec9e30509b76cb376abb65a4d8af27df3 (diff)
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[TCP]: cubic update for net-2.6.22
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>
-rw-r--r--net/ipv4/tcp_cubic.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/net/ipv4/tcp_cubic.c b/net/ipv4/tcp_cubic.c
index 15c58037500..296845be912 100644
--- a/net/ipv4/tcp_cubic.c
+++ b/net/ipv4/tcp_cubic.c
@@ -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");