From fb80a6e1a521eb298edb4365429d533dd39427fa Mon Sep 17 00:00:00 2001 From: Stephen Hemminger Date: Fri, 2 Jun 2006 17:51:08 -0700 Subject: [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: Stephen Hemminger Signed-off-by: David S. Miller --- net/ipv4/tcp_highspeed.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/ipv4/tcp_highspeed.c b/net/ipv4/tcp_highspeed.c index b72fa55dfb84d1..ba7c63ca5bb108 100644 --- a/net/ipv4/tcp_highspeed.c +++ b/net/ipv4/tcp_highspeed.c @@ -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++; -- cgit 1.2.3-korg