tcp: fix tcp_should_expand_sndbuf() to use tcp_packets_in_flight()
authorNeal Cardwell <ncardwell@google.com>
Fri, 20 Feb 2015 18:33:16 +0000 (13:33 -0500)
committerDavid S. Miller <davem@davemloft.net>
Mon, 23 Feb 2015 04:07:11 +0000 (23:07 -0500)
tcp_should_expand_sndbuf() does not expand the send buffer if we have
filled the congestion window.

However, it should use tcp_packets_in_flight() instead of
tp->packets_out to make this check.

Testing has established that the difference matters a lot if there are
many SACKed packets, causing a needless performance shortfall.

Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Nandita Dukkipati <nanditad@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv4/tcp_input.c

index 8fdd27b173061def484663beeace691a8bfa2365..fb4cf8b8e121acd4bffcf2fdfbd7e03c76bad7cc 100644 (file)
@@ -4770,7 +4770,7 @@ static bool tcp_should_expand_sndbuf(const struct sock *sk)
                return false;
 
        /* If we filled the congestion window, do not expand.  */
-       if (tp->packets_out >= tp->snd_cwnd)
+       if (tcp_packets_in_flight(tp) >= tp->snd_cwnd)
                return false;
 
        return true;