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Q4. An 80386 system operates with a paged memory system of 4G bytes. Figure Q4 shows a part of the memory space of the system. The starting address of the page directory is 00023000H. Address 0002 3010H L00022003H 0002 300CH 00020003H 0002 3008H00121003H 0002 3004H 00002003H 0002 3000H 00120003H 00022FFCH 00023003H Address 0012 100CH 00112003H 0012 1008H 00110003H 0012 1004H 00100000H 0012 1000H 00003003H 00120FFCH 00000003H 0012 OFF8H 00003003H 0000 2010H00112003H 0000200CH 00110003H 0000 2008H 00111003H 0000 2004H 00023003H 0000 2000H 00000003H 0012 000CH 00112003H 0012 0008H00110003H 0012 0004H 00111003H 0012 0000H 00003003H 0011FFFCH 00000003H 00001FFCH 00003003H 0011FFF8H 00003003H Figure Q4 Address 0011 100CH 00122003H 0011 1008H 00120003H 0011 1004H 00121003H 0011 1000H 00001003H 00110FFCH 00002003H 0011 OFF8H 00003003H 0011 0014H00122003H 0011 0010H 00120003H 0011 000CH 00121003H 0011 0008H 00023003H 0011 0004H 00020003H 0011 0000H 00002003H Note: The leftmost byte in a cell is the byte having the highest address. (a) Determine the physical address associated with the logical address 00803500H. (b) Memory overhead is required to realize the page system. What is the impact on the memory overhead if we quadruple the total size of the memory system under the condition that the page size is fixed? (c) Consider the case mentioned in Q4(b). If the size of a page table entry and the size of a page directory entry are both 4 bytes, estimate the size of the table directory in terms of number of pages.

Q4. An 80386 system operates with a paged memory system of 4G bytes. Figure Q4 shows a part of the memory space of the system. The starting address of the page directory is 00023000H. Address 0002 3010H L00022003H 0002 300CH 00020003H 0002 3008H00121003H 0002 3004H 00002003H 0002 3000H 00120003H 00022FFCH 00023003H Address 0012 100CH 00112003H 0012 1008H 00110003H 0012 1004H 00100000H 0012 1000H 00003003H 00120FFCH 00000003H 0012 OFF8H 00003003H 0000 2010H00112003H 0000200CH 00110003H 0000 2008H 00111003H 0000 2004H 00023003H 0000 2000H 00000003H 0012 000CH 00112003H 0012 0008H00110003H 0012 0004H 00111003H 0012 0000H 00003003H 0011FFFCH 00000003H 00001FFCH 00003003H 0011FFF8H 00003003H Figure Q4 Address 0011 100CH 00122003H 0011 1008H 00120003H 0011 1004H 00121003H 0011 1000H 00001003H 00110FFCH 00002003H 0011 OFF8H 00003003H 0011 0014H00122003H 0011 0010H 00120003H 0011 000CH 00121003H 0011 0008H 00023003H 0011 0004H 00020003H 0011 0000H 00002003H Note: The leftmost byte in a cell is the byte having the highest address. (a) Determine the physical address associated with the logical address 00803500H. (b) Memory overhead is required to realize the page system. What is the impact on the memory overhead if we quadruple the total size of the memory system under the condition that the page size is fixed? (c) Consider the case mentioned in Q4(b). If the size of a page table entry and the size of a page directory entry are both 4 bytes, estimate the size of the table directory in terms of number of pages.

Database System Concepts
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
Section: Chapter Questions
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Q4. An 80386 system operates with a paged memory system of 4G bytes. Figure Q4 shows a part of the memory space of the system. The starting address of the page directory is 00023000H. Address 0002 3010H 00022003H 0002 300CH 00020003H 0002 3008H00121003H 0002 3004H 00002003H 0002 3000H 00120003H 00022FFCH 00023003H 0000 2010H00112003H 0000200CH 00110003H 0000 2008H00111003H 0000 2004H 00023003H 0000 2000H 00000003H 00001FFCH 00003003H Address 0012 100CH 00112003H 00110003H 0012 1008H 0012 1004H 00100000H 0012 1000H 00003003H 00120FFCH 00000003H 0012 OFF8H 00003003H 0012 000CH 00112003H 0012 0008H00110003H 0012 0004H 00111003H 0012 0000H 00003003H 0011FFFCH 00000003H 0011FFF8H 00003003H Figure Q4 Address 0011100CH 00122003H 0011 1008H 00120003H 0011 1004H 00121003H 0011 1000H 00001003H 00110FFCH 00002003H 0011 OFF8H 00003003H 0011 0014H00122003H 0011 0010H 00120003H 0011 000CH 00121003H 0011 0008H 00023003H 0011 0004H 00020003H 0011 0000H 00002003H Note: The leftmost byte in a cell is the byte having the highest address. (a) Determine the physical address associated with the logical address 00803500H. (b) Memory overhead is required to realize the page system. What is the impact on the memory overhead if we quadruple the total size of the memory system under the condition that the page size is fixed? (c) Consider the case mentioned in Q4(b). If the size of a page table entry and the size of a page directory entry are both 4 bytes, estimate the size of the table directory in terms of number of pages.
Transcribed Image Text:Q4. An 80386 system operates with a paged memory system of 4G bytes. Figure Q4 shows a part of the memory space of the system. The starting address of the page directory is 00023000H. Address 0002 3010H 00022003H 0002 300CH 00020003H 0002 3008H00121003H 0002 3004H 00002003H 0002 3000H 00120003H 00022FFCH 00023003H 0000 2010H00112003H 0000200CH 00110003H 0000 2008H00111003H 0000 2004H 00023003H 0000 2000H 00000003H 00001FFCH 00003003H Address 0012 100CH 00112003H 00110003H 0012 1008H 0012 1004H 00100000H 0012 1000H 00003003H 00120FFCH 00000003H 0012 OFF8H 00003003H 0012 000CH 00112003H 0012 0008H00110003H 0012 0004H 00111003H 0012 0000H 00003003H 0011FFFCH 00000003H 0011FFF8H 00003003H Figure Q4 Address 0011100CH 00122003H 0011 1008H 00120003H 0011 1004H 00121003H 0011 1000H 00001003H 00110FFCH 00002003H 0011 OFF8H 00003003H 0011 0014H00122003H 0011 0010H 00120003H 0011 000CH 00121003H 0011 0008H 00023003H 0011 0004H 00020003H 0011 0000H 00002003H Note: The leftmost byte in a cell is the byte having the highest address. (a) Determine the physical address associated with the logical address 00803500H. (b) Memory overhead is required to realize the page system. What is the impact on the memory overhead if we quadruple the total size of the memory system under the condition that the page size is fixed? (c) Consider the case mentioned in Q4(b). If the size of a page table entry and the size of a page directory entry are both 4 bytes, estimate the size of the table directory in terms of number of pages.
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