如果数据或指令没有出现在高速缓存中，或者如果高速缓存线路无效的时候，CPU通过从主存储器中读数据来更新它的高速缓存。
If the data or instruction is not present in the cache, or if the cache line is invalidated, the CPU updates its cache by reading the data from the main memory.
实验结果表明，启用高速缓存对提高指令的平均执行速度具有较大影响。
Experimental results show that it has great influence to improve instruction mean executive speed when the cache is enabled.
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