Root/
1 | /* Tom Kelly's Scalable TCP |
2 | * |
3 | * See http://www.deneholme.net/tom/scalable/ |
4 | * |
5 | * John Heffner <jheffner@sc.edu> |
6 | */ |
7 | |
8 | #include <linux/module.h> |
9 | #include <net/tcp.h> |
10 | |
11 | /* These factors derived from the recommended values in the aer: |
12 | * .01 and and 7/8. We use 50 instead of 100 to account for |
13 | * delayed ack. |
14 | */ |
15 | #define TCP_SCALABLE_AI_CNT 50U |
16 | #define TCP_SCALABLE_MD_SCALE 3 |
17 | |
18 | static void tcp_scalable_cong_avoid(struct sock *sk, u32 ack, u32 in_flight) |
19 | { |
20 | struct tcp_sock *tp = tcp_sk(sk); |
21 | |
22 | if (!tcp_is_cwnd_limited(sk, in_flight)) |
23 | return; |
24 | |
25 | if (tp->snd_cwnd <= tp->snd_ssthresh) |
26 | tcp_slow_start(tp); |
27 | else |
28 | tcp_cong_avoid_ai(tp, min(tp->snd_cwnd, TCP_SCALABLE_AI_CNT)); |
29 | } |
30 | |
31 | static u32 tcp_scalable_ssthresh(struct sock *sk) |
32 | { |
33 | const struct tcp_sock *tp = tcp_sk(sk); |
34 | return max(tp->snd_cwnd - (tp->snd_cwnd>>TCP_SCALABLE_MD_SCALE), 2U); |
35 | } |
36 | |
37 | |
38 | static struct tcp_congestion_ops tcp_scalable = { |
39 | .ssthresh = tcp_scalable_ssthresh, |
40 | .cong_avoid = tcp_scalable_cong_avoid, |
41 | .min_cwnd = tcp_reno_min_cwnd, |
42 | |
43 | .owner = THIS_MODULE, |
44 | .name = "scalable", |
45 | }; |
46 | |
47 | static int __init tcp_scalable_register(void) |
48 | { |
49 | return tcp_register_congestion_control(&tcp_scalable); |
50 | } |
51 | |
52 | static void __exit tcp_scalable_unregister(void) |
53 | { |
54 | tcp_unregister_congestion_control(&tcp_scalable); |
55 | } |
56 | |
57 | module_init(tcp_scalable_register); |
58 | module_exit(tcp_scalable_unregister); |
59 | |
60 | MODULE_AUTHOR("John Heffner"); |
61 | MODULE_LICENSE("GPL"); |
62 | MODULE_DESCRIPTION("Scalable TCP"); |
63 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9