Consider a demand-paging system with a paging disk that has an average access time of 20 milliseconds (ms). Addresses are translated through a page table in main memory, with an access time of 2 millisecond (ms) per main memory access. Assume page fault ratio is 10 percent. (a) [5 pt] Assume the paper table has two levels. What’s the effective memory access time? (b) [5 pt] To improve this time, we can add a TLB that reduces access time if the page-table entry is in the TLB. Assume access time

Database System Concepts
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Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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Consider a demand-paging system with a paging disk that has an average access time of 20 milliseconds
(ms). Addresses are translated through a page table in main memory, with an access time of 2
millisecond (ms) per main memory access. Assume page fault ratio is 10 percent.
(a) [5 pt] Assume the paper table has two levels. What’s the effective memory access time?
(b) [5 pt] To improve this time, we can add a TLB that reduces access time if the page-table entry is in
the TLB. Assume access time to TLB is 0.5 millisecond (ms) and 80 percent of the accesses hit in the TLB.
Assume page table has one level. What’s the effective memory access time?

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