1. TLB Performance
Seung Ki Lee

2. What is TLB

3. Table Lookaside Buffer
What is TLB
A Type of Cache
Part of MMU
Stores Virtual & Physical Address
“Looks Aside” at the TLB at Translation
Table Lookaside Buffer

4. Table Lookaside Buffer
What is TLB
Table Lookaside Buffer

5. How does TLB work

6. Virtual Memory Translation
Holds Translations of Virtual Address to Physical Address
Stores Most Recently Used
How does TLB work
Virtual Memory Translation

7. Virtual Memory Translation
How does TLB work
Virtual Memory Translation

8. Advantages of Having TLB

9. Advantages of TLB
How Much Faster is it?

10. Advantages of TLB
How Much Faster is it?

11. Calculating TLB Performance

12. Calculating TLB Performance
Average Performance

13. Calculating TLB Performance
Average Performance

14. Calculating TLB Performance
Average Performance

15. Calculating TLB Performance
Average Performance

16. Handling Page Faults and TLB Misses

17. Handling Page Faults and TLB Misses

18. Handling Page Faults and TLB Misses
Page Structure built into MMU
OS automatically steps in
-> More Efficient
Handling Page Faults and TLB Misses
Hardware

19. Handling Page Faults and TLB Misses
Entire Page Structure built into MMU
-> Expensive Production
-> Smaller TLB size
-> More Frequent TLB Misses
Good for data TLB where TLB Misses are inevitable
Handling Page Faults and TLB Misses
Hardware

20. Handling Page Faults and TLB Misses
Page Fault will send interrupt to OS
Larger TLB
-> Better Hit rate
-> Less Frequent TLB Misses
Handling Page Faults and TLB Misses
Software

21. Handling Page Faults and TLB Misses
Longer time to deal with each miss
-> More expensive TLB miss penalty
Good for Instruction TLB with temporally local memory access
Handling Page Faults and TLB Misses
Software

22. Questions