diff options
| author | Stephen Hemminger <shemminger@linux-foundation.org> | 2007-03-25 06:34:38 +0200 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-04-26 07:28:09 +0200 |
| commit | e1c3e7ab6de9711d2e0e9daf369c6638582eb7e7 (patch) | |
| tree | 2df5485e75fb622b0f587bf0c7273c83f0d66e62 /net/ipv4/tcp_cubic.c | |
| parent | [NET] Move DF check to ip_forward (diff) | |
| download | linux-e1c3e7ab6de9711d2e0e9daf369c6638582eb7e7.tar.xz linux-e1c3e7ab6de9711d2e0e9daf369c6638582eb7e7.zip | |
[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>
Diffstat (limited to 'net/ipv4/tcp_cubic.c')
| -rw-r--r-- | net/ipv4/tcp_cubic.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/net/ipv4/tcp_cubic.c b/net/ipv4/tcp_cubic.c index 15c580375002..296845be912b 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"); |