What is the architectural significance of "tagged" caches versus "physically indexed, physically tagged" (PIPT) caches with respect to virtual memory?
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The correct answer is A) Caches can be indexed/tagged using virtual or physical addresses; PIPT caches avoid aliasing (different virtual addresses mapping to one physical address) but need translation first, adding latency, while virtual-indexed caches are faster but complex
Correct Answer
Caches can be indexed/tagged using virtual or physical addresses; PIPT caches avoid aliasing (different virtual addresses mapping to one physical address) but need translation first, adding latency, while virtual-indexed caches are faster but complex
The choice between virtually and physically indexed/tagged caches involves a trade-off between access latency (avoiding address translation on the critical path) and complications like aliasing, where multiple virtual addresses map to the same physical location, requiring careful handling.