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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 <[email protected]> Signed-off-by: Yuchung Cheng <[email protected]> Signed-off-by: Eric Dumazet <[email protected]> Signed-off-by: Nandita Dukkipati <[email protected]> Signed-off-by: David S. Miller <[email protected]>