The intermediate buffer on the write side allows the write to complete asynchronously.
在写入方面的中间缓冲区则可以让写入过程异步完成。
Using the intermediate buffer on the read side allows the kernel buffer to act as a "readahead cache" when the application hasn't asked for as much data as the kernel buffer holds.
在读取方面使用中间内核缓冲区，可以允许内核缓冲区在应用程序不需要内核缓冲区内的全部数据时，充当 “预读高速缓存（readahead cache）” 的角色。
Intermediate buffer copies - even those hidden in the kernel - can have a measurable cost.
中间缓冲区拷贝—甚至于那些隐藏在内核内的拷贝—都会产生一定的开销。
Intermediate buffer copies - even those hidden in the kernel - can have a measurable cost.
中间缓冲区拷贝—甚至于那些隐藏在内核内的拷贝—都会产生一定的开销。
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