The size of the physical address (the address used by the processor to index physical RAM) limits the amount of memory that can be addressed.
物理地址(处理器用于索引物理ram的地址)的大小限制了可以寻址的内存。
The vmstat command provides a long-term view of virtual usage, including providing information on the amount of memory being actively swapped between swap space and RAM.
vmstat 命令可以提供虚拟内存使用情况的长期视图，包括提供有关交换空间与 RAM 之间正在活动地交换的内存量的信息。
Some kernel levels require a parameter to enable large memory support on systems with more than a certain amount of ram.
有些内核级别可能需要一个参数来启用RAM大于一定量的系统上的大内存支持。
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