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authorSangtae Ha <sha2@ncsu.edu>2008-03-04 14:17:41 -0800
committerDavid S. Miller <davem@davemloft.net>2008-03-04 14:17:41 -0800
commit6b3d626321c1d4ce9138a86b047dfafc6a403016 (patch)
tree0708e10ff8c603c014fa3c4ca88f7b51a2c0eb16
parent7019b78e1483fa724dcba56e8465376b8fd03ea8 (diff)
[TCP]: TCP cubic v2.2
We have updated CUBIC to fix some issues with slow increase in large BDP networks. We also improved its convergence speed. The fix is in fact very simple -- the window increase limit of smax during the window probing phase (i.e., convex growth phase) is removed. We found that this does not affect TCP friendliness, but only improves its scalability. We have run some tests in our lab and also over the Internet path from NCSU to Japan. These results can be seen from the following page: http://netsrv.csc.ncsu.edu/wiki/index.php/Intra_protocol_fairness_testing_with_linux-2.6.23.9 http://netsrv.csc.ncsu.edu/wiki/index.php/RTT_fairness_testing_with_linux-2.6.23.9 http://netsrv.csc.ncsu.edu/wiki/index.php/TCP_friendliness_testing_with_linux-2.6.23.9 Signed-off-by: Sangtae Ha <sha2@ncsu.edu> Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/ipv4/tcp_cubic.c35
1 files changed, 8 insertions, 27 deletions
diff --git a/net/ipv4/tcp_cubic.c b/net/ipv4/tcp_cubic.c
index 3aa0b23c1ea0..eb5b9854c8c7 100644
--- a/net/ipv4/tcp_cubic.c
+++ b/net/ipv4/tcp_cubic.c
@@ -1,12 +1,13 @@
/*
- * TCP CUBIC: Binary Increase Congestion control for TCP v2.1
- *
+ * TCP CUBIC: Binary Increase Congestion control for TCP v2.2
+ * Home page:
+ * http://netsrv.csc.ncsu.edu/twiki/bin/view/Main/BIC
* This is from the implementation of CUBIC TCP in
* Injong Rhee, Lisong Xu.
* "CUBIC: A New TCP-Friendly High-Speed TCP Variant
* in PFLDnet 2005
* Available from:
- * http://www.csc.ncsu.edu/faculty/rhee/export/bitcp/cubic-paper.pdf
+ * http://netsrv.csc.ncsu.edu/export/cubic-paper.pdf
*
* Unless CUBIC is enabled and congestion window is large
* this behaves the same as the original Reno.
@@ -20,15 +21,10 @@
#define BICTCP_BETA_SCALE 1024 /* Scale factor beta calculation
* max_cwnd = snd_cwnd * beta
*/
-#define BICTCP_B 4 /*
- * In binary search,
- * go to point (max+min)/N
- */
#define BICTCP_HZ 10 /* BIC HZ 2^10 = 1024 */
static int fast_convergence __read_mostly = 1;
-static int max_increment __read_mostly = 16;
-static int beta __read_mostly = 819; /* = 819/1024 (BICTCP_BETA_SCALE) */
+static int beta __read_mostly = 717; /* = 717/1024 (BICTCP_BETA_SCALE) */
static int initial_ssthresh __read_mostly;
static int bic_scale __read_mostly = 41;
static int tcp_friendliness __read_mostly = 1;
@@ -40,9 +36,7 @@ static u64 cube_factor __read_mostly;
/* Note parameters that are used for precomputing scale factors are read-only */
module_param(fast_convergence, int, 0644);
MODULE_PARM_DESC(fast_convergence, "turn on/off fast convergence");
-module_param(max_increment, int, 0644);
-MODULE_PARM_DESC(max_increment, "Limit on increment allowed during binary search");
-module_param(beta, int, 0444);
+module_param(beta, int, 0644);
MODULE_PARM_DESC(beta, "beta for multiplicative increase");
module_param(initial_ssthresh, int, 0644);
MODULE_PARM_DESC(initial_ssthresh, "initial value of slow start threshold");
@@ -145,7 +139,7 @@ static u32 cubic_root(u64 a)
static inline void bictcp_update(struct bictcp *ca, u32 cwnd)
{
u64 offs;
- u32 delta, t, bic_target, min_cnt, max_cnt;
+ u32 delta, t, bic_target, max_cnt;
ca->ack_cnt++; /* count the number of ACKs */
@@ -211,19 +205,6 @@ static inline void bictcp_update(struct bictcp *ca, u32 cwnd)
ca->cnt = 100 * cwnd; /* very small increment*/
}
- if (ca->delay_min > 0) {
- /* max increment = Smax * rtt / 0.1 */
- min_cnt = (cwnd * HZ * 8)/(10 * max_increment * ca->delay_min);
-
- /* use concave growth when the target is above the origin */
- if (ca->cnt < min_cnt && t >= ca->bic_K)
- ca->cnt = min_cnt;
- }
-
- /* slow start and low utilization */
- if (ca->loss_cwnd == 0) /* could be aggressive in slow start */
- ca->cnt = 50;
-
/* TCP Friendly */
if (tcp_friendliness) {
u32 scale = beta_scale;
@@ -391,4 +372,4 @@ module_exit(cubictcp_unregister);
MODULE_AUTHOR("Sangtae Ha, Stephen Hemminger");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("CUBIC TCP");
-MODULE_VERSION("2.1");
+MODULE_VERSION("2.2");