tcp_cubic: make hystart_ack_delay() aware of BIG TCP
hystart_ack_delay() had the assumption that a TSO packet would not be bigger than GSO_MAX_SIZE. This will no longer be true. We should use sk->sk_gso_max_size instead. This reduces chances of spurious Hystart ACK train detections. Signed-off-by: Eric Dumazet <edumazet@google.com> Acked-by: Alexander Duyck <alexanderduyck@fb.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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