...TACK变量来决定; (b), 接收缓冲(Receive Buffer/Connection Buffer), 由NET_BUFFER_LENGTH参数决定; (c), 发送缓冲(Send Buffer/Result Buffer), 同接收缓冲区同样大小.
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The third value is the maximum send buffer space (overridden by wmem_max).
第三个值是发送缓冲区空间的最大字节数（该值会被 wmem_max 覆盖）。
The first value is the minimum number of bytes allocated for the socket's send buffer.
第一个值是为socket的发送缓冲区分配的最少字节数。
The completion of the send operation does not depend on the status of a matching receive, and merely indicates that the send buffer can be reused.
发送操作的完成不依赖于对应的接收函数的状态，并且仅意味着发送缓冲区可以被重用。
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