In case of a TLB Miss, what would happen? a) The operating system will crash the...
In case of a TLB Miss, what would happen?
a) The operating system will crash the system
b) The operating system will raise an exception
c) The operating system will retrieve the missing page from the disk memory
d) The operating system will check the Page Table in search of the missed virtual address
Homework Answers
The answer is D. TLB is the cache of the page table, so if there is TLB miss then we should retrieve this address from the page table.
Add Answer to:
In case of a TLB Miss, what would happen?
a) The operating system will crash the...
18. You have a byte-addressable virtual memory system with a two-entry TLB, a 2-way set associati...
18. You have a byte-addressable virtual memory system with a two-entry TLB, a 2-way set associative cache, and a page table for a process P. Assume cache blocks of 8 bytes and page size of 16 bytes. In the system below, main memory is divided into blocks, where each block is represented by a letter. Two blocks equal one frame. Given the system state as depicted above, answer the following questions: a) How many bits are in a virtual address...
A computer uses a byte-addressable virtual memory system with a four-entry TLB and a page table...
A computer uses a byte-addressable virtual memory system with a four-entry TLB and a page table for a process P. Pages are 16 bytes in size. Main memory contains 8 frames and the page table contains 16 entries. a. How many bits are required for a virtual address? b. How many bits are required for a physical address?
Address Translation Question [8 points] Suppose a computing system uses paging with a logical add...
Address Translation Question
[8 points] Suppose a computing system uses paging with a logical
address of 24 bits and a
physical address of 32 bits. The page size is 4KB. Answer each of
the following. If an answer is a power of 2, you can leave it in
the form of a power of 2. ...
2. [20 points] Memory address translation and TLB performance [8 points] Suppose a computing system uses paging with a logical address of 24 bits...
4. Assume it take 50 nanoseconds to resolve a memory reference when accessing the physical memory address directly. a) We designed a system using virtual addresses with page tables without a TLB. In...
4. Assume it take 50 nanoseconds to resolve a memory reference when accessing the physical memory address directly. a) We designed a system using virtual addresses with page tables without a TLB. In other words, when fetching data from memory, the page table is accessed to get the PTE for translating an address, a translation is completed, and finally, a memory reference to the desired data is resolved. In this system, what is the effective memory reference time. Assume the...
Question 31 supus Given a computer using a byte-addressable virtual memory system with a two-entry TLB,...
Question 31 supus Given a computer using a byte-addressable virtual memory system with a two-entry TLB, a 2-way set associative cache, and a page table for a process P. Assume cache blocks of size 16 bytes. Assume pages of size 32 bytes and a main memory of 4 frames. Assume the following TLB and page table for Process P: TLB 03 4 هما 0 1 2 3 4 5 6 7 Page Table f Vali d 1 1 0 2...
As described in 5.7, virtual memory uses a page table to track the mapping of virtual...
As described in 5.7, virtual memory uses a page table to track the mapping of virtual addresses to the physical addresses. This exercise shows how this table must be updated as addresses are accessed. The following data constitutes a stream of virtual addresses as seen on a system. Assume 4 KiB pages, a 4-entry fully associative TLB, and true LRU replacement. If pages must be brought in from disk, increment the next largest page number. 4669, 2227, 13916, 34587, 48870,...
Number Name 3. Assuming no page fault on a page table access, what is the processor...
Number Name 3. Assuming no page fault on a page table access, what is the processor memory access time for the system depicted in the above figure, for a physical memory with 50ns read/write times? 4. Now, assume that the memory system has a translation look-aside buffer (TLB). The TLB requires 10 ns to determine a hit or mess. The physical memory system has an access time of 50ns. You may assume that page fault rate for the application is...
answer for all questions.... How do modern operating systems solve this? [3 marks] i) This is...
answer for all questions....
How do modern operating systems solve this? [3 marks] i) This is a snapshot of a page table and a translation look aside buffer (TLB) of an operating system (Assume that these are the only populated entries). Toble 1: Page Table Entry Virtual Page Page Frame Time Loaded Time R bit M bit number Referenced 2 0 60 161 0 1 1 1 130 0 160 1 2 26 162 0 1 30 3 20 163...
3. Consider a paging system with the page table in memory. A. If a memory reference...
3. Consider a paging system with the page table in memory. A. If a memory reference takes 100 nanoseconds, how long does a paged memory reference take? B. If we add TLBs, and 75 percent of all page-table references are found in the TLBs, what is the effective memory reference time? (Assume that finding a page-table entry for the TLBs takes 20 nanoseconds.) C. It takes 750 milliseconds to service a page fault. The page fault rate is .001. What...
1) Given a virtual memory system with: virtual address 36 bits physical address 32 bits 32KB...
1) Given a virtual memory system with: virtual address 36 bits physical address 32 bits 32KB pages (15 bit page offset) Each page table entry has bits for valid, execute, read and dirty (4 bits total) and bits for a physical page number. a) How many bits in the page table? (do not answer in bytes!) Three digit accuracy is good enough. The exponent may be either a power of 2 or a power of 10. b) The virtual address...
18. You have a byte-addressable virtual memory system with a two-entry TLB, a 2-way set associative cache, and a page table for a process P. Assume cache blocks of 8 bytes and page size of 16 bytes. In the system below, main memory is divided into blocks, where each block is represented by a letter. Two blocks equal one frame. Given the system state as depicted above, answer the following questions: a) How many bits are in a virtual address...
Address Translation Question
[8 points] Suppose a computing system uses paging with a logical
address of 24 bits and a
physical address of 32 bits. The page size is 4KB. Answer each of
the following. If an answer is a power of 2, you can leave it in
the form of a power of 2. ...
2. [20 points] Memory address translation and TLB performance [8 points] Suppose a computing system uses paging with a logical address of 24 bits...
4. Assume it take 50 nanoseconds to resolve a memory reference when accessing the physical memory address directly. a) We designed a system using virtual addresses with page tables without a TLB. In other words, when fetching data from memory, the page table is accessed to get the PTE for translating an address, a translation is completed, and finally, a memory reference to the desired data is resolved. In this system, what is the effective memory reference time. Assume the...
Question 31 supus Given a computer using a byte-addressable virtual memory system with a two-entry TLB, a 2-way set associative cache, and a page table for a process P. Assume cache blocks of size 16 bytes. Assume pages of size 32 bytes and a main memory of 4 frames. Assume the following TLB and page table for Process P: TLB 03 4 هما 0 1 2 3 4 5 6 7 Page Table f Vali d 1 1 0 2...
As described in 5.7, virtual memory uses a page table to track the mapping of virtual addresses to the physical addresses. This exercise shows how this table must be updated as addresses are accessed. The following data constitutes a stream of virtual addresses as seen on a system. Assume 4 KiB pages, a 4-entry fully associative TLB, and true LRU replacement. If pages must be brought in from disk, increment the next largest page number. 4669, 2227, 13916, 34587, 48870,...
Number Name 3. Assuming no page fault on a page table access, what is the processor memory access time for the system depicted in the above figure, for a physical memory with 50ns read/write times? 4. Now, assume that the memory system has a translation look-aside buffer (TLB). The TLB requires 10 ns to determine a hit or mess. The physical memory system has an access time of 50ns. You may assume that page fault rate for the application is...
answer for all questions....
How do modern operating systems solve this? [3 marks] i) This is a snapshot of a page table and a translation look aside buffer (TLB) of an operating system (Assume that these are the only populated entries). Toble 1: Page Table Entry Virtual Page Page Frame Time Loaded Time R bit M bit number Referenced 2 0 60 161 0 1 1 1 130 0 160 1 2 26 162 0 1 30 3 20 163...
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