What is the maximum acceptable page-fault rate

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Reference no: EM133424002

Question: Assume that we have a paged memory, which is being used in "real mode" (i.e. without virtual memory). The page table is stored in the main memory. The memory access time is 200 nanoseconds. This system uses a TLB, which takes 10 nanoseconds for searching. It was found to have a hit rate of 90%. What is the effective memory access time for this system?

(b) Now suppose that this system with the TLB data given above is a demand paged virtual memory system. It takes 5 milliseconds to service a page fault if an empty frame is available or if the replaced page is not modified, and 10 milliseconds if the replaced page is modified (i.e. dirty). Assume that 40% of the time an empty frame is available or the page to be replaced is not modified. What is the maximum acceptable page-fault rate for an effective access time of no more than 250 nanoseconds?

Reference no: EM133424002

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