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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>
This commit is contained in:
Neal Cardwell 2011-11-16 08:58:05 +00:00 committed by David S. Miller
parent f698204bd0
commit 8cd6d6162d
1 changed files with 2 additions and 1 deletions
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3
net/ipv4/tcp_input.c
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@ -2881,7 +2881,8 @@ 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);
tcp_moderate_cwnd(tp);
if (inet_csk(sk)->icsk_ca_state != TCP_CA_Open)
tcp_moderate_cwnd(tp);
} else {
tcp_cwnd_down(sk, flag);
}