TLB HITS

Parshu gate asked in Databases Nov 11, 2017 retagged Nov 13, 2017 by Arjun

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2 votes

What is the average memory access time (correct to two decimal places) when you have the following memory hierarchy? Assume that (i) the cache uses physical addresses, (ii) the CPU stalls until the data is delivered, (iii) everything fits into the memory, and (iv) the hardware does the page table walk and updates TLB.

translation-lookaside-buffer
hit-ratio
co-and-architecture
cache-memory

Parshu gate asked in Databases Nov 11, 2017 retagged Nov 13, 2017 by Arjun

by Parshu gate

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2 Answers

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is it 17.45?

arch answered Nov 13, 2017

by arch

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is it 114.05?

aishvarya0502 answered Nov 23, 2017

by aishvarya0502

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2 votes

1 answer

dd asked in Operating System Jan 13, 2019

758 views

TLB hit ration and memory lookup time
Consider a system where TLB lookup time is $25$ ns and memory access time is $200$ ns, respectively. Assuming a virtual address space of $2$ KB, page size of $32$ bytes, and a PTE size of $2$ bytes, what is the minimum TLB hit ratio that results in an average v2p (virtual to physical) translation latency of $185$ ns?

dd asked in Operating System Jan 13, 2019

by dd

758 views

translation-lookaside-buffer
hit-ratio

0 votes

1 answer

rahuljai asked in Operating System Dec 3, 2018

1,293 views

TLB OS
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.

rahuljai asked in Operating System Dec 3, 2018

by rahuljai

1.3k views

translation-lookaside-buffer
operating-system
hit-ratio
paging
virtual-memory

2 votes

1 answer

Akash Kumar Roy asked in Operating System Apr 5, 2018

2,624 views

My doubt on TLB and page fault
First read this whole thing what I am writing below: Case 1: If we have to access unit address in memory using TLB and we assume that no page fault occurs then, EMAT=p( T+M )+( 1-p ) (T+M+M) T=TLB access time, M= ... if there page fault occurs then how does the last calculated EMAT here affects the first Estimated memory access time which we have calculated using TLB?

Akash Kumar Roy asked in Operating System Apr 5, 2018

by Akash Kumar Roy

2.6k views

operating-system
translation-lookaside-buffer
hit-ratio
page-fault
effective-memory-access

5 votes

1 answer

habedo007 asked in Operating System Aug 8, 2017

955 views

Multilevel TLB performance
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).

habedo007 asked in Operating System Aug 8, 2017

by habedo007

955 views

operating-system
translation-lookaside-buffer
paging
hit-ratio

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TLB HITS

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