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。

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.

youdao

如果数据一段时间未被使用，将最终从高速缓存区释放，将由新的数据代替。

Data that has not been used for a while is eventually released from the cache to make room for new data.

youdao

如果数据一段时间未被使用，将最终从高速缓存区释放，将由新的数据代替。

Data that has not been used for a while is eventually released from the cache to make room for new data.

youdao