对DMA PUT 进行排队，从而将缓冲区传输回主内存。

Queue a DMA PUT to transfer the buffer back to main memory.

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主内存的CPU缓存极其重要，需要特别关注(参见参考资料)。

CPU caching of main memory is so important that it deserves special attention (see Resources).

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提示：为了发现分配给主缓冲池的内存有多少，可以发出。

Tip: to find out how much memory is allocated to main buffer pools, issue.

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提示：为了发现分配给主缓冲池的内存有多少，可以发出。

Tip: to find out how much memory is allocated to main buffer pools, issue.

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