这是台大资工的题目...不过有一段话看不太懂..题目有点长.. Consider a system with an average memory access time of 50ns, a three level page table(meta-directory, directory, and page table).For full credit, your answer must be a single number and not a formula. a)....省略 b)Now assume the system has no page faults , we are considering adding a TLB that will take 1ns to lookup an address translation. What hit rate in the TLB is required to reduct the effective access time to memory by a factor of 2.5? ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 请教一下，最後划线的地方，这句话是什麽意思呢?? 谢谢帮忙 --

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