Operating Systems - TLB - Translation Lookaside Buffer & Effective Access Time
Which scenario best illustrates when a Translation Lookaside Buffer (TLB) significantly improves system performance?
Which scenario best illustrates when a Translation Lookaside Buffer (TLB) significantly improves system performance?
easy🔍 Pattern Recognition Q1 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand TLB purpose
The TLB caches recent virtual-to-physical address translations to speed up address translation.Step 2: Analyze each scenario
A: Single-level page table with infrequent accesses means TLB hits are rare, so little benefit.
B: Large physical memory with rare virtual memory use doesn't guarantee locality or TLB benefit.
C: CPU repeatedly accessing a small set of pages causes high locality of reference, leading to frequent TLB hits and improved performance.
D: If page table is cached and TLB is disabled, no TLB benefit occurs.Final Answer:
Option A -> Option AQuick Check:
High locality -> frequent TLB hits -> better performance [OK]
Quick Trick: High locality of reference maximizes TLB benefit [OK]
Common Mistakes:
MISTAKES- Assuming TLB helps even with infrequent accesses
- Confusing physical memory size with TLB effectiveness
- Believing page table cache replaces TLB
Trap Explanation:
PITFALL- Candidates often think TLB always helps regardless of access patterns, ignoring locality.
Interviewer Note:
CONTEXT- Reveals candidate's grasp of TLB's role and locality impact.
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