If a memory reference takes 200 ns, how long does a paged memory reference take? Now we add an MMU that imposes an overhead of 20 ns on a hit or a miss. If we assume that 85% of all memory references hit in the MMU TLB, what is the effective Memory Access Time (EMAT)? Explain how the TLB hit rate affects the EMAT.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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Consider a system with memory mapping done on a page basis and using a single level page
table. Assume that the necessary page table is always in memory.
a. If a memory reference takes 200 ns, how long does a paged memory reference take?
b. Now we add an MMU that imposes an overhead of 20 ns on a hit or a miss. If we assume
that 85% of all memory references hit in the MMU TLB, what is the effective Memory
Access Time (EMAT)?
c. Explain how the TLB hit rate affects the EMAT.
Transcribed Image Text:Consider a system with memory mapping done on a page basis and using a single level page table. Assume that the necessary page table is always in memory. a. If a memory reference takes 200 ns, how long does a paged memory reference take? b. Now we add an MMU that imposes an overhead of 20 ns on a hit or a miss. If we assume that 85% of all memory references hit in the MMU TLB, what is the effective Memory Access Time (EMAT)? c. Explain how the TLB hit rate affects the EMAT.
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