Commit aac46324 authored by stephen hemminger's avatar stephen hemminger Committed by David S. Miller
Browse files

tcp_cubic: make ack train delta value a parameter 



Make the spacing between ACK's that indicates a train a tuneable
value like other hystart values.

Signed-off-by: default avatarStephen Hemminger <shemminger@vyatta.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c54b4b76

net/ipv4/tcp_cubic.c

+4 −1
Original line number Diff line number Diff line
@@ -52,6 +52,7 @@ static int tcp_friendliness __read_mostly = 1; 
static int hystart __read_mostly = 1;

static int hystart_detect __read_mostly = HYSTART_ACK_TRAIN | HYSTART_DELAY;

static int hystart_low_window __read_mostly = 16;

static int hystart_ack_delta __read_mostly = 2;



static u32 cube_rtt_scale __read_mostly;

static u32 beta_scale __read_mostly;
@@ -75,6 +76,8 @@ MODULE_PARM_DESC(hystart_detect, "hyrbrid slow start detection mechanisms" 
		 " 1: packet-train 2: delay 3: both packet-train and delay");

module_param(hystart_low_window, int, 0644);

MODULE_PARM_DESC(hystart_low_window, "lower bound cwnd for hybrid slow start");

module_param(hystart_ack_delta, int, 0644);

MODULE_PARM_DESC(hystart_ack_delta, "spacing between ack's indicating train (msecs)");



/* BIC TCP Parameters */

struct bictcp {
@@ -343,7 +346,7 @@ static void hystart_update(struct sock *sk, u32 delay) 


		/* first detection parameter - ack-train detection */

		if ((s32)(curr_jiffies - ca->last_jiffies) <=

		    msecs_to_jiffies(2)) {

		    msecs_to_jiffies(hystart_ack_delta)) {

			ca->last_jiffies = curr_jiffies;

			if ((s32) (curr_jiffies - ca->round_start) >

			    ca->delay_min >> 4)