V_tcp_delack_enabled
(V_tcp_delack_enabled || (tp->t_flags & TF_NEEDSYN)))
if (V_tcp_delack_enabled == 1)
else if (V_tcp_delack_enabled == 0)
else if (V_tcp_delack_enabled < 100)
tp->t_delayed_ack = V_tcp_delack_enabled;
if (V_tcp_delack_enabled)