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。
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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