Commit 9dc27415 authored Jul 20, 2012 by Eric Dumazet Committed by David S. Miller Jul 20, 2012

tcp: fix ABC in tcp_slow_start()



When/if sysctl_tcp_abc > 1, we expect to increase cwnd by 2 if the
received ACK acknowledges more than 2*MSS bytes, in tcp_slow_start()

Problem is this RFC 3465 statement is not correctly coded, as
the while () loop increases snd_cwnd one by one.

Add a new variable to avoid this off-by one error.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Tom Herbert <therbert@google.com>
Cc: Yuchung Cheng <ycheng@google.com>
Cc: Neal Cardwell <ncardwell@google.com>
Cc: Nandita Dukkipati <nanditad@google.com>
Cc: John Heffner <johnwheffner@gmail.com>
Cc: Stephen Hemminger <shemminger@vyatta.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 5815d5e7

net/ipv4/tcp_cong.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -307,6 +307,7 @@ EXPORT_SYMBOL_GPL(tcp_is_cwnd_limited);
		void tcp_slow_start(struct tcp_sock *tp)
		{
		int cnt; /* increase in packets */
		unsigned int delta = 0;

		/* RFC3465: ABC Slow start
		* Increase only after a full MSS of bytes is acked
		@@ -333,9 +334,9 @@ void tcp_slow_start(struct tcp_sock *tp)
		tp->snd_cwnd_cnt += cnt;
		while (tp->snd_cwnd_cnt >= tp->snd_cwnd) {
		tp->snd_cwnd_cnt -= tp->snd_cwnd;
		if (tp->snd_cwnd < tp->snd_cwnd_clamp)
		tp->snd_cwnd++;
		delta++;
		}
		tp->snd_cwnd = min(tp->snd_cwnd + delta, tp->snd_cwnd_clamp);
		}
		EXPORT_SYMBOL_GPL(tcp_slow_start);