Which of the following statements about Effective Access Time (EAT) in systems using TLB is INCORRECT?

medium🐞 Bug Identification Q14 of Q15

Operating Systems - TLB - Translation Lookaside Buffer & Effective Access Time

AA TLB miss always causes a page fault, increasing EAT drastically

BEAT depends on both TLB hit ratio and memory access time

CEAT can be calculated as (TLB hit ratio x TLB access time) + (TLB miss ratio x page table access time)

DImproving TLB hit ratio reduces the average memory access time

Step-by-Step Solution

Step 1: Recall EAT formula
EAT = (hit ratio x access time on hit) + (miss ratio x access time on miss)
Step 2: Analyze each statement
A: Correct, EAT depends on hit ratio and memory times.
B: Incorrect, TLB miss does not always cause page fault; it triggers page table lookup.
C: Correct, formula reflects hit and miss costs.
D: Correct, higher hit ratio lowers average access time.
Final Answer:
Option A -> Option A
Quick Check:
TLB miss ≠ page fault; page fault only if page not in memory.

Quick Trick: TLB miss ≠ page fault; page fault only if page absent [OK]

Common Mistakes:

MISTAKES

Trap Explanation:

PITFALL

Option B is a common misconception; TLB miss triggers page table lookup, not necessarily a page fault.

Interviewer Note:

CONTEXT

Tests candidate's understanding of EAT calculation and difference between TLB miss and page fault.

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