Explicitly invalidate a region of physical memory from the cache hierarchy before doing a DMA, to ensure coherency.
明确地做一个DMA，以确保一致性无效之前从缓存层次结构的物理内存区域。
By providing a cache hierarchy that maps to the provider's network topology, ISPs can create regional cache areas supported by groups of cache servers.
通过提供映射供应商网络拓朴的高速缓存层次结构，ISP可以创建由高速缓存服务器组所支持的区域性高速缓存区。
Changes in the group hierarchy are not directly reflected until the cache entry times out.
直到缓存条目超时才直接反映组层次结构中的更改。
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