Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN: 9780133594140
Author: James Kurose, Keith Ross
Publisher: PEARSON
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Question
Consider a logical address space of 32 pages of 1024 words each,
mapped onto a physical memory of 8 frames. How many bits are there in
logical address and how many bits are there in physical address?
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- Suppose a computer system uses 16-bit addresses for both its virtual and physical addresses. In addition, assume each page (and frame) has size 256 bytes. How many bits are used for the page number? How many bits are used for the offset? 8 bits each. With this system, what’s the maximum number of pages that a process can have? 256 Suppose that each entry in the page table comprises 4 bytes (including the frame number, the valid bit, and miscellaneous “bookkeeping bits”). An OS uses an array to store the page table. What is the size of the page table? 1024 Bytes Furthermore, suppose the first 6 pages of a process map to frames 222 to 227 (as decimal numbers), and the last 5 pages of the process map to frames 1 to 5 (also decimal numbers). All other pages are invalid. Draw the page table, including the valid bit and the frame number. DONE Translate the following virtual addresses to physical addresses, and show how you obtain the answers. (Hint: You do not need to convert…arrow_forwardSuppose the RAM for a certain computer has 4M words, where each word is 16 bits long. What is the capacity of this memory expressed in bytes? If this RAM is byte addressable, how many bits must an address contain? If this RAM is word addressable, how many bits must an address contain?arrow_forwardConsider a logical address space of 1K pages with a 4KB page size, mapped onto a physical memory of 128 frames. 1. How many bits are required in the logical address? Logical bits- 2. How many bits are required in the physical address? Physical bis-arrow_forward
- consider you are looking at a virtual memory of size 1 GiB also a physical memory of size 128 KiB and a page size equal to 8 KiB. FIgure out how many bits are used to specify a virtual page number?arrow_forwardGiven a virtual memory of size 4 GiB, physical memory of size 512 KiB, and page size equal to 4 KiB. How many bits are used to specify a physical page number?arrow_forwardGiven a virtual memory of size 4 GiB, physical memory of size 1 GiB, and page size equal to 256 KiB. How many bits are used to specify a virtual page number?arrow_forward
- Assume a logical address space consists of 4 pages of 4096 words each and is mapped to a physical memory space of 256 frames. What is the size of the physical address space? 12 bits 14 bits 20 bits 8 bitsarrow_forward16-bit virtual addressesarrow_forwardSuppose we have a byte-addressable computer with a cache that holds 8 blocks of 4 bytes each. Assuming that each memory address has 8 bits, to which cache block would the hexadecimal address 0x2D map if the computer uses direct mapping? Blocks are numbered starting at 0arrow_forward
- Suppose a computer using fully associative cache has 224 words of main memory and a cache of 512 blocks, where each cache block contains 16 words. How many blocks of main memory are there? What is the format of a memory address as seen by the cache, i.e., what are the sizes of the tag and offset fields? To which cache block will the memory reference 17042416 map?arrow_forwardSuppose a computer system uses 16 but addresses for both virtual and physical address. In addition, assume each page (and frame) has a size of 256 bytes. -How many bits are used for page number? -How many bits for offset? -what is the max number of pages a process can have?arrow_forward
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