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[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>
wifi-calibration
Daikichi Osuga 2006-08-29 02:01:44 -07:00 committed by David S. Miller
parent 76d0cc1b64
commit 3fdf3f0c99
2 changed files with 8 additions and 3 deletions
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2
net/ipv4/tcp_cong.c
View File

@ -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++;
}

9
net/ipv4/tcp_input.c
View File

@ -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)
tp->bytes_acked += ack - prior_snd_una;
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.