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Commit 3fdf3f0c authored Aug 29, 2006 by Daikichi Osuga Committed by David S. Miller Aug 29, 2006

[TCP]: Two RFC3465 Appropriate Byte Count fixes.



1) fix slow start after retransmit timeout
2) fix case of L=2*SMSS acked bytes comparison

Signed-off-by: Daikichi Osuga <osugad@s1.nttdocomo.co.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 76d0cc1b

net/ipv4/tcp_cong.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -189,7 +189,7 @@ void tcp_slow_start(struct tcp_sock *tp)
		return;

		/* We MAY increase by 2 if discovered delayed ack */
		if (sysctl_tcp_abc > 1 && tp->bytes_acked > 2*tp->mss_cache) {
		if (sysctl_tcp_abc > 1 && tp->bytes_acked >= 2*tp->mss_cache) {
		if (tp->snd_cwnd < tp->snd_cwnd_clamp)
		tp->snd_cwnd++;
		}

net/ipv4/tcp_input.c

+7 −2

Original line number	Diff line number	Diff line
		@@ -2505,8 +2505,13 @@ static int tcp_ack(struct sock sk, struct sk_buff skb, int flag)
		if (before(ack, prior_snd_una))
		goto old_ack;

		if (sysctl_tcp_abc && icsk->icsk_ca_state < TCP_CA_CWR)
		if (sysctl_tcp_abc) {
		if (icsk->icsk_ca_state < TCP_CA_CWR)
		tp->bytes_acked += ack - prior_snd_una;
		else if (icsk->icsk_ca_state == TCP_CA_Loss)
		/* we assume just one segment left network */
		tp->bytes_acked += min(ack - prior_snd_una, tp->mss_cache);
		}

		if (!(flag&FLAG_SLOWPATH) && after(ack, prior_snd_una)) {
		/* Window is constant, pure forward advance.