Commit 8cd6d616 authored Nov 16, 2011 by Neal Cardwell Committed by David S. Miller Nov 27, 2011

tcp: skip cwnd moderation in TCP_CA_Open in tcp_try_to_open



The problem: Senders were overriding cwnd values picked during an undo
by calling tcp_moderate_cwnd() in tcp_try_to_open().

The fix: Don't moderate cwnd in tcp_try_to_open() if we're in
TCP_CA_Open, since doing so is generally unnecessary and specifically
would override a DSACK-based undo of a cwnd reduction made in fast
recovery.

Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent f698204b

net/ipv4/tcp_input.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -2881,6 +2881,7 @@ static void tcp_try_to_open(struct sock *sk, int flag)

		if (inet_csk(sk)->icsk_ca_state != TCP_CA_CWR) {
		tcp_try_keep_open(sk);
		if (inet_csk(sk)->icsk_ca_state != TCP_CA_Open)
		tcp_moderate_cwnd(tp);
		} else {
		tcp_cwnd_down(sk, flag);