Operating System: Translation Lookaside Buffers Where should the TLB be placed? How large should it be? What actions should be taken during context switches?
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Operating System: The Translation Lookaside Buffer (TLB) is a hardware component that is used by the operating system to speed up the virtual memory translation process. It is a cache that stores recently used virtual-to-physical address translations. Show more…
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Consider a memory subsystem with the following characteristics: 20-bit virtual address 16-bit physical address 210-byte (1KB) page size 4-way set-associative TLB with 8 total lines 4-way set-associative data cache with 16 total lines and a block size of 8 bytes Determine the virtual address breakdown into the following fields: (for each bit range below, specify the start index followed by the end index; e.g., 0-5, 4-4, 6-10) Virtual page offset bits: Virtual page number bits: TLB index: TLB tag: Determine the physical address breakdown into the following fields: (for each bit range below, specify the start index followed by the end index; e.g., 0-5, 4-4, 6-10) Physical page offset bits: Physical page number bits: Cache offset: Cache index: Cache tag:
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4. Consider a direct-mapped cache with 128 blocks and a block size of 16 bytes, and the page size is 1 KiB. Using the following virtual address (32-bits byte address) and TLB, answer the questions: Virtual address: 1200 TLB Valid | Tag | Physical Page Number 1 | 4 | 12 0 | 9 | 4 1 | 1 | 6 1 | 2 | 8 1 | 0 | 7 4-1. Convert the virtual address into the physical address (32-bits). 4-2. Calculate tag, index, and offset as decimal numbers.
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