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Module 5: Memory Management

20227m

Consider a paging hardware with a TLB. Assume that the entire page table and all the pages are in the physical memory. It takes 10 milliseconds to search the TLB and 80 milliseconds to access the physical memory. If the TLB hit ratio is 0.6, find the effective memory access time (in milliseconds).

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TLB Effective Access

EAT = hit*(TLB+Mem) + miss*(TLB+2Mem) =0.6(10+80)+0.4*(10+160)=0.690+0.4170=54+68=122ms. If search overlapped, alternative 128ms. TLB caching reduces avg.

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