Question

If the system with paging uses TLB, and has TLB hit rate of 0:9, calculate the effective memory access time for this system. Assume that TLB access requires 10ns and each memory access requires 100ns.

Answer 1

Q-> If the system with paging uses TLB, and has TLB hit rate of 0:9, calculate the effective memory access time for this system. Assume that TLB access requires 10ns and each memory access requires 100ns.

.

Given:

H = TLB hit rate = 0.9

A = TLB access time = 10 ns

M = memory access time = 100 ns

Using Formula:

=> Effective memory access time = H * (A + M) + (1-H) * ( A + 2 * M)

=> Effective memory access time = 0.9 * (10 + 100) + (1-0.9) * ( 10 + 2 * 100)

=> Effective memory access time = 0.9 * 110 + 0.1 * 210 = 99 + 21 = 120 ns

=> => Effective memory access time is 120 ns.