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A translational look aside buffer is a hardware device used for speeding up the conversation from virtual address to physical address. Consider a memory management unit where a memory reference takes 500 nanoseconds; TLB (Translation Look aside Buffer) reference takes 40 nanoseconds; and the hit-rate achieved with the use of TLB is 80%. The speed-up (in %) we gained using TLB technique compared to the pure paging with no TLB ________.

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without TLB, total time=2*memory access time=2*500ns=1000ns

with TLB, total time=0.8(500+40)+0.2(40+1000)=640ns

speed up=1000/640=1.56

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