A memory system has the following performancecharacteristics:Cache Tag Check time: 1nsCache Read Time: 1nsCache Line Size: 64 bytesMemory Access time (Time to start memory operation): 10 nsMemory Transfer time: 1ns/memory wordMemory Word: 16 bytesThe processor is pipelined and has a clock cycle of 500 MHz.The memory operation occupies one stage in the pipeline. If ittakes longer, the pipeline is stalled.How long does it take to service a memory operation if itmisses in the cache?

Answer 2nsec 140ns 90 hits -> 0 stall; 10 misses -> (15+1-2)*10=140 ns stall timeNote: The…

A memory system has the following performance characteristics: Cache Tag Check time: 1ns Cache Read Time: 1ns Cache Line Size: 64 bytes Memory Access time (Time to start memory operation): 10 ns Memory Transfer time: 1ns/memory word Memory Word: 16 bytes

A memory system has the following performance characteristics: Cache Tag Check time: 1ns Cache Read Time: 1ns Cache Line Size: 64 bytes Memory Access time (Time to start memory operation): 10 ns Memory Transfer time: 1ns/memory word Memory Word: 16 bytes

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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You have a CPU which contains two processor cores, connected via a bus. Each core has its own 8 row, direct-mapped L1 cache and the two caches are coherent via snoopy cache coherent over the bus, with a write-invalidate mechanism. The block size in the cache is 8 bytes (two words). Core A: Load byte address 63 Core A: Load byte address 57 Core B: Store byte address 63 Core A: Store byte address 63 Core B: Load byte address 102 Core A: Load byte address 121 Core A: Load byte address 57 For each access from the list above, please indicate whether the access would be a hit, a compulsory miss, a conflict miss, a capacity miss, or a coherence miss. Before the sequence begins, both caches are empty. First access (Core A address 63): Second access (Core A address 57): Third access (Core B address 63): Fourth access (Core A address 63): Fifth access (Core B address 102): Sixth access (Core A address 121): Seventh access (Core A address 57):
At the same time as the processor is making a request to the cache, it is returning a block from the write buffer to main memory.
At the same time as it sends a block from the write buffer back to main memory, the processor makes a request to the cache.
The main memory of a computer is addressed by bytes and is managed by two-level paging storage. The address structure is as follows: Outer Page (10 bits) Inner Page (10 bits) Page offset (12 digits) The outer page number and inner page number corresponding to the logical address 0x20501225 are ____ , ____ respectively. 0x081, 0x101 0x081, 0x401 0x201, 0x101 0x201, 0x401
The central processing unit (CPU) could ask for a cache hit while it is moving data from the write buffer to the main memory.
What should the processor do if a cache request can't be completed while a block is being written back into main memory from the write buffer?
The processor requests the cache from main memory while rewriting a block from the write buffer.
During the process of transferring data from the write buffer to the main memory, the CPU may request a cache hit.
Small as it may be, cache memory plays a crucial role in today's computers. Explain why cache memory was developed and why it wasn't available in earlier computer systems.
Cache requests are sent from the central processor unit to the RAM in the system. whenever a block in the main memory write buffer has to be updated.
How should the CPU react if it is unable to satisfy a cache request while writing a block from the write buffer back into main memory?
The processor requests the cache when writing a block from the write buffer to main memory.