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Avg. virtual address access time = avg address translation time+avg. memory access time

Why do we need address translation time separately?(otherwise we do TLB access, then cache access then MM access)

Avg address translation time=TLB access time+page table access time 

Why do we calculating page table access time separately(cache access time itself do that)

reference see this


In another formula they have done TLB hit(cache hit+cache miss)+...

My question is if TLB hit is taking then why do we take cache hit? We take cache hit, when TLB miss



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