SudoGate Test Series - Virtual Memory

Question

A computer system has TLB access time = 30 ns and the main memory access time is 150 ns and if the miss rate is 20 % the calculate the effective memory access time if 3 level of paging is applied.

 

i am getting 270 ns

Comments

Yes me too getting 270ns

EMA=0.8*(30+150)+0.2(30+150*3+150)

What's the ans given?

---

Please add the test-series name

---

they did this in this way  but i think they did wrong

TLB access time (c)= 30 ns TLB miss rate = 20% = 0.2 TLB hit rate (x) = 1 - TLB miss rate = 1 - 0.2 = 0.8 Main memory access time(m) = 150 ns Effective memory access time Using TLB = x*(c+m) + (1-x)*(c+ (n + 1)*m ) Where n shows the level of paging. = 0.8 * ( 30 + 150 ) + 0.2 * ( 30 + (2 + 1) * 150 ) = 0.8 * ( 30 + 150 ) + 0.2 * ( 30 + 3 * 150 ) = 240 ns So, option (B) is correct

---

i think they are consider only two level of paging

---

The one you mentioned is too complicated to read :p and yes they took n=2

---

@gurdeep.saini same here mate getting 270ns .you r right

---

yes, 270ns