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tcp: fix tcp_should_expand_sndbuf() to use tcp_packets_in_flight()

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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>
This commit is contained in:
Neal Cardwell 2015-02-20 13:33:16 -05:00 committed by David S. Miller
parent 52d6c8c6ca
commit 6514890f7a
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/tcp_input.c
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@ -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;