Assume that in a certain computer, the virtual addresses are 64 bits long and the physical addresses are 48 bits long. The memory is word addressable. The page size is 8 kB and the word size is 4 bytes. The Translation Look-aside Buffer (TLB) in the address translation path has 128 valid entries. At most how many distinct virtual addresses can be translated without any TLB miss?
A |
8×220 |
B |
4×220 |
C |
16×210 |
D |
256×210 |
A TLB has 128 valid entries.
So, it can refer to 27 pages.
Each page size is 8 kB & word is 4 bytes.
So, the total addresses of virtual address spaces that can be addressed
-------------------------------------------------------
Number of words in a page = Page size / word size = 8 KB / 4 B = 2 K = 2 * 210
Since TLB can hold 128 valid entries, therefore, TLB can translate
= 128 * number of words in page = 128 * 2 * 210 = 256 * 210 addresses with TLB hit
So, option (D) is correct.
Thank You