Consider an overly simplistic direct cache of 256 bytes arranged as 16 cache lines of 16 bytes each. Assume that the low order 4 bits of an address indicates the byte within the cache line and the next 4 bits indicate which cache line slot should be used. Assuming no useful data is in the cache at the beginning, how many cache misses will result from the following sequence of addresses being read from memory. Note each cache line that will be loaded into the cache in order. Show the state of the cache at the end of this activity. (each address is given in hexadecimal) 00A20140 00A20144

Computer Networking: A Top-Down Approach (7th Edition)
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Author:James Kurose, Keith Ross
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Chapter1: Computer Networks And The Internet
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1. cache behavior
Consider an overly simplistic direct cache of 256 bytes arranged as 16 cache lines of 16
bytes each. Assume that the low order 4 bits of an address indicates the byte within the
cache line and the next 4 bits indicate which cache line slot should be used.
Assuming no useful data is in the cache at the beginning, how many cache misses will
result from the following sequence of addresses being read from memory. Note each
cache line that will be loaded into the cache in order.
Show the state of the cache at the end of this activity.
(each address is given in hexadecimal)
00A20140
00A20144
7FFF2120
7FFF211C
7FFF2108
00A20100
7FFF2100
7FFF10F8
7EFF10E0
7EFF10F0
00A20160
00A20164
00A20160
00A20108
00A20140
Transcribed Image Text:1. cache behavior Consider an overly simplistic direct cache of 256 bytes arranged as 16 cache lines of 16 bytes each. Assume that the low order 4 bits of an address indicates the byte within the cache line and the next 4 bits indicate which cache line slot should be used. Assuming no useful data is in the cache at the beginning, how many cache misses will result from the following sequence of addresses being read from memory. Note each cache line that will be loaded into the cache in order. Show the state of the cache at the end of this activity. (each address is given in hexadecimal) 00A20140 00A20144 7FFF2120 7FFF211C 7FFF2108 00A20100 7FFF2100 7FFF10F8 7EFF10E0 7EFF10F0 00A20160 00A20164 00A20160 00A20108 00A20140
Assume 256 byte direct cache w/ 16 byte lines
further assume nothing useful starts in cache
what is hit rate for following address req's
A0024 MISS
A0028 HIT
A1020 MISS
8 misses
А002C MISS
40010
40010 MISS
3 hits
A0020
40020 MISS
||| accesses
0024 MISS
A0010 MISS
3/11
40014 MISS
hit rate
A0024 HIT
40010 HIT
or 27.3%
Transcribed Image Text:Assume 256 byte direct cache w/ 16 byte lines further assume nothing useful starts in cache what is hit rate for following address req's A0024 MISS A0028 HIT A1020 MISS 8 misses А002C MISS 40010 40010 MISS 3 hits A0020 40020 MISS ||| accesses 0024 MISS A0010 MISS 3/11 40014 MISS hit rate A0024 HIT 40010 HIT or 27.3%
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