An ACL packet, which can interrupt the regular flow of SCO data.
为一acl数据包，可中断正常的SCO数据流。
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The sender utilization seems to be poorly correlated with its load as a function of packet size; so does the "hi"% utilization (hardware interrupt) of the receiver.
tcp_input() executes at the s/w interrupt, and picks up the SYN packet from ipintrq, processes it, and places the partially completed socket connection in an incomplete socket queue.
tcp_input() 在 s/w 中断时执行，并从 ipintrq 拾取 SYN 包，对其进行处理，并将部分完成的套接字连接放入完成的套接字队列。