TCP/IP is usually a four-layer protocol. For reducing system expense by the data copy, the system operate through indicator,data is upwardly transmisated along the ptotocol stack in the buffer.
采取TCP/IP协议四层之间通过函数进行数据传递;通过指针操作,将缓冲区中的数据沿协议栈向上传递,减少了数据拷贝的系统开销。
参考来源 - 嵌入式TCP/IP协议的研究与ARM实现·2,447,543篇论文数据，部分数据来源于NoteExpress
可能的情况下，确保本地有最新的数据拷贝。
Make sure to have an up-to-date copy of the data on-premise, if that's possible.
而且，它节省了不必要的数据拷贝和内存消耗。
And, it saves unnecessary data copies and memory consumption.
本质上这意味着数据拷贝，这在中间件是十分昂贵的操作应当予以避免。
Essentially this is a data copy which in middleware is very expensive and should be avoided.
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