SPE 程序从输入缓冲区中读取数据，然后对数据进行处理，再将结果写入输出缓冲区中。
The SPE program reads in the input buffer, processes the data, and then writes it to the output buffer.
数据可以直接从读取缓冲区传输到套接字缓冲区。
Instead, the data could be transferred directly from the read buffer to the socket buffer.
在示例程序中，总是用4k的缓冲区读取事件数据。
In the sample program, event data is always read with a buffer of 4k.
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