Commit 03fba047 authored by Ilpo Järvinen's avatar Ilpo Järvinen Committed by David S. Miller
Browse files

[TCP] Highspeed: Limited slow-start is nowadays in tcp_slow_start 



Reuse limited slow-start (RFC3742) included into tcp_cong instead
of having another implementation in High Speed TCP.

Signed-off-by: default avatarIlpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 72fbaeb6

net/ipv4/tcp_highspeed.c

+3 −21
Original line number Diff line number Diff line
@@ -97,10 +97,6 @@ struct hstcp { 
	u32	ai;

};



static int max_ssthresh = 100;

module_param(max_ssthresh, int, 0644);

MODULE_PARM_DESC(max_ssthresh, "limited slow start threshold (RFC3742)");



static void hstcp_init(struct sock *sk)

{

	struct tcp_sock *tp = tcp_sk(sk);
@@ -122,23 +118,9 @@ static void hstcp_cong_avoid(struct sock *sk, u32 adk, u32 rtt, 
	if (!tcp_is_cwnd_limited(sk, in_flight))

		return;



	if (tp->snd_cwnd <= tp->snd_ssthresh) {

		/* RFC3742: limited slow start

		 * the window is increased by 1/K MSS for each arriving ACK,

		 * for K = int(cwnd/(0.5 max_ssthresh))

		 */

		if (max_ssthresh > 0 && tp->snd_cwnd > max_ssthresh) {

			u32 k = max(tp->snd_cwnd / (max_ssthresh >> 1), 1U);

			if (++tp->snd_cwnd_cnt >= k) {

				if (tp->snd_cwnd < tp->snd_cwnd_clamp)

					tp->snd_cwnd++;

				tp->snd_cwnd_cnt = 0;

			}

		} else {

			if (tp->snd_cwnd < tp->snd_cwnd_clamp)

				tp->snd_cwnd++;

		}

	} else {

	if (tp->snd_cwnd <= tp->snd_ssthresh)

		tcp_slow_start(tp);

	else {

		/* Update AIMD parameters.

		 *

		 * We want to guarantee that: