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TLB misses
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Operating System
Jan 13, 2019
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Shubham Sharma 2
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Jan 13, 2019
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Why the formula used here is not P(10) + (1-P)(50) = 20 ?; A computer keeps its page tables in memory. The time required to read a word from the page table is 50ns. To reduce this overhead, the computer has a TLB, which holds 32 (virtual page, physical page frame) pairs and can ... : 10ns + (1 - p) 50ns = 20ns p =4/5 = .80 The TLB hit rate has to be 80% for a mean access time of 20ns.
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habedo007
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A computer has a 128-entry $L_1$ TLB, 1024-entry $L_2$ TLB, and uses page size of 4KB. A program reads a 1MB array, one byte at a time from start to end, 10 times. Assuming the TLBs are directly mapped and initially empty, and no other memory is accessed, find TLB hits and misses of both $L_1$ and $L_2$ TLB (array is page aligned).
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Neal Caffery
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Consider a memory system consists of a single external cache with an access time of 30ns and a hit rate of 0.85, and a main memory with an access time of 80ns. Now we add virtual memory to the system. The TLB is implemented internal to the processor chip and takes ... memory access time of the system with virtual memory?( Marks: 0.00 ) 8ns 30ns 40ns 51ns
Neal Caffery
asked
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Operating System
Jan 17, 2017
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