Operating Systems - TLB - Translation Lookaside Buffer & Effective Access Time
Which of the following statements about the trade-offs of increasing TLB size is TRUE?
Which of the following statements about the trade-offs of increasing TLB size is TRUE?
medium🪤 Complexity Trap Q13 of Q15
Step-by-Step Solution
Step 1: Understand TLB size impact
Larger TLB can cache more translations, increasing hit rate.Step 2: Consider trade-offs
However, larger TLBs have longer lookup times and consume more power and chip area.Step 3: Analyze options
A: Correct, bigger TLBs have diminishing returns and increased latency.
B: Incorrect, increasing size does not always reduce access time without downsides.
C: Incorrect, larger TLBs increase power and area.
D: Incorrect, page tables remain necessary for full address translation.Final Answer:
Option D -> Option DQuick Check:
Trade-offs include lookup latency and hardware cost, not just hit rate.
Quick Trick: Bigger TLB -> better hit rate but slower lookup and more power [OK]
Common Mistakes:
MISTAKES- Assuming bigger TLB is always better
- Ignoring hardware cost and latency
Trap Explanation:
PITFALL- Option A is correct because bigger TLBs increase lookup latency; option D is a misunderstanding of virtual memory.
Interviewer Note:
CONTEXT- Tests candidate's understanding of hardware trade-offs in TLB design.
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