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1. Consider a paging system with the Page Map Table (PMT) stored in physical memory. a) If access time to the memory is 100 nanoseconds, how long does a paged memory reference takes? b) If we add associative registers to store the whole PMT in the associative registers. Calculate the Effective Access Time (EAT) if the associative memories search time is 10 nanoseconds.

1. Consider a paging system with the Page Map Table (PMT) stored in physical memory. a) If access time to the memory is 100 nanoseconds, how long does a paged memory reference takes? b) If we add associative registers to store the whole PMT in the associative registers. Calculate the Effective Access Time (EAT) if the associative memories search time is 10 nanoseconds.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Question 6: 1. Consider a paging system with the Page Map Table (PMT) stored in physical memory. a) If access time to the memory is 100 nanoseconds, how long does a paged memory reference takes? b) If we add associative registers to store the whole PMT in the associative registers. Calculate the Effective Access Time (EAT) if the associative memories search time is 10 nanoseconds. 2. Consider a CPU that uses 20 bits to represent the logical addresses. Assume that we want to implement a paging mechanism where the page size is 2Kbytes. (Hint 1 kilobyte (Kb) = 2^10 bytes = 1,024 bytes. 1 megabyte (MB) = 2^20 bytes = 1,048,576 bytes. 1 gigabyte (GB) = 2^30 bytes = 1,073,741,824 bytes) a) What is the size of the logical space in bytes? b) How many bits is used for the page number? c) Give the physical address translation to the logical address 5000 if we assume the following PMT Page number Frame number 1 1 2 3 3 Show the calculation steps: d) Assume an OS is using LRU page replacement strategy with 3 pages' frames for the following list of references 2, 1, 3, 4, 1, 2, 5, 1, 2, 3. Give the page replacement sequence and the number of page faults. Fill the replacement table. e) If access to the physical memory is 100 nanoseconds and the fault service time is 1ms, compute the Effective Access Time for the whole list of references.
Transcribed Image Text:Question 6: 1. Consider a paging system with the Page Map Table (PMT) stored in physical memory. a) If access time to the memory is 100 nanoseconds, how long does a paged memory reference takes? b) If we add associative registers to store the whole PMT in the associative registers. Calculate the Effective Access Time (EAT) if the associative memories search time is 10 nanoseconds. 2. Consider a CPU that uses 20 bits to represent the logical addresses. Assume that we want to implement a paging mechanism where the page size is 2Kbytes. (Hint 1 kilobyte (Kb) = 2^10 bytes = 1,024 bytes. 1 megabyte (MB) = 2^20 bytes = 1,048,576 bytes. 1 gigabyte (GB) = 2^30 bytes = 1,073,741,824 bytes) a) What is the size of the logical space in bytes? b) How many bits is used for the page number? c) Give the physical address translation to the logical address 5000 if we assume the following PMT Page number Frame number 1 1 2 3 3 Show the calculation steps: d) Assume an OS is using LRU page replacement strategy with 3 pages' frames for the following list of references 2, 1, 3, 4, 1, 2, 5, 1, 2, 3. Give the page replacement sequence and the number of page faults. Fill the replacement table. e) If access to the physical memory is 100 nanoseconds and the fault service time is 1ms, compute the Effective Access Time for the whole list of references.
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