tcp: fix tcp_should_expand_sndbuf() to use tcp_packets_in_flight()
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>
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@ -4770,7 +4770,7 @@ static bool tcp_should_expand_sndbuf(const struct sock *sk)
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return false;
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/* If we filled the congestion window, do not expand. */
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if (tp->packets_out >= tp->snd_cwnd)
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if (tcp_packets_in_flight(tp) >= tp->snd_cwnd)
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return false;
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return true;
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