forked from luck/tmp_suning_uos_patched
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: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -52,6 +52,7 @@ static int tcp_friendliness __read_mostly = 1;
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static int hystart __read_mostly = 1;
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static int hystart_detect __read_mostly = HYSTART_ACK_TRAIN | HYSTART_DELAY;
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static int hystart_low_window __read_mostly = 16;
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static int hystart_ack_delta __read_mostly = 2;
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static u32 cube_rtt_scale __read_mostly;
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static u32 beta_scale __read_mostly;
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@ -75,6 +76,8 @@ MODULE_PARM_DESC(hystart_detect, "hyrbrid slow start detection mechanisms"
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" 1: packet-train 2: delay 3: both packet-train and delay");
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module_param(hystart_low_window, int, 0644);
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MODULE_PARM_DESC(hystart_low_window, "lower bound cwnd for hybrid slow start");
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module_param(hystart_ack_delta, int, 0644);
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MODULE_PARM_DESC(hystart_ack_delta, "spacing between ack's indicating train (msecs)");
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/* BIC TCP Parameters */
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struct bictcp {
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@ -343,7 +346,7 @@ static void hystart_update(struct sock *sk, u32 delay)
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/* first detection parameter - ack-train detection */
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if ((s32)(curr_jiffies - ca->last_jiffies) <=
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msecs_to_jiffies(2)) {
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msecs_to_jiffies(hystart_ack_delta)) {
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ca->last_jiffies = curr_jiffies;
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if ((s32) (curr_jiffies - ca->round_start) >
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ca->delay_min >> 4)
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