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Commit fb80a6e1 authored by Stephen Hemminger's avatar Stephen Hemminger Committed by David S. Miller
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[TCP] tcp_highspeed: Fix problem observed by Xiaoliang (David) Wei 



When snd_cwnd is smaller than 38 and the connection is in
congestion avoidance phase (snd_cwnd > snd_ssthresh), the snd_cwnd
seems to stop growing.

The additive increase was confused because C array's are 0 based.

Signed-off-by: default avatarStephen Hemminger <shemminger@osdl.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 0f326215

net/ipv4/tcp_highspeed.c

+2 −1
Original line number Diff line number Diff line
@@ -135,7 +135,8 @@ static void hstcp_cong_avoid(struct sock *sk, u32 adk, u32 rtt, 


		/* Do additive increase */

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

			tp->snd_cwnd_cnt += ca->ai;

			/* cwnd = cwnd + a(w) / cwnd */

			tp->snd_cwnd_cnt += ca->ai + 1;

			if (tp->snd_cwnd_cnt >= tp->snd_cwnd) {

				tp->snd_cwnd_cnt -= tp->snd_cwnd;

				tp->snd_cwnd++;