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A paging scheme uses a Translation Look-aside Buffer (TLB). A TLB-access takes 10 ns and a main memory access takes 50 ns. What is the effective access time(in ns) if the TLB hit ratio is 90% and there is no page-fault?
  • a)
    54
  • b)
    60
  • c)
    65
  • d)
    75
Correct answer is option 'C'. Can you explain this answer?
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A paging scheme uses a Translation Look-aside Buffer (TLB). A TLB-acce...
Effective access time = hit ratio * time during hit + miss ratio * time during miss TLB time = 10ns, Memory time = 50ns Hit Ratio= 90% E.A.T. = (0.90)*(60)+0.10*110 =65
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Most Upvoted Answer
A paging scheme uses a Translation Look-aside Buffer (TLB). A TLB-acce...
Given:
- TLB access time = 10 ns
- Main memory access time = 50 ns
- TLB hit ratio = 90%
- No page-fault

To find:
Effective access time (in ns)

Explanation:
The effective access time is the average time taken to access a memory location, taking into account both TLB hits and TLB misses.

The formula to calculate the effective access time is:
Effective Access Time = (TLB hit ratio * TLB access time) + ((1 - TLB hit ratio) * Main memory access time)

Calculation:
Given:
TLB hit ratio = 90% = 0.9
TLB access time = 10 ns
Main memory access time = 50 ns

Using the formula:
Effective Access Time = (0.9 * 10 ns) + ((1 - 0.9) * 50 ns)
= (0.9 * 10 ns) + (0.1 * 50 ns)
= 9 ns + 5 ns
= 14 ns

Therefore, the effective access time is 14 ns.

Conclusion:
The effective access time, when the TLB hit ratio is 90% and there is no page-fault, is 14 ns.
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A paging scheme uses a Translation Look-aside Buffer (TLB). A TLB-access takes 10 ns and a main memory access takes 50 ns. What is the effective access time(in ns) if the TLB hit ratio is 90% and there is no page-fault?a)54b)60c)65d)75Correct answer is option 'C'. Can you explain this answer?
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