TLB Performance Seung Ki Lee

What is TLB

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

Table Lookaside Buffer What is TLB Table Lookaside Buffer

How does TLB work

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

Virtual Memory Translation How does TLB work Virtual Memory Translation

Advantages of Having TLB

Advantages of TLB How Much Faster is it?

Advantages of TLB How Much Faster is it?

Calculating TLB Performance

Calculating TLB Performance Average Performance

Calculating TLB Performance Average Performance

Calculating TLB Performance Average Performance

Calculating TLB Performance Average Performance

Handling Page Faults and TLB Misses

Handling Page Faults and TLB Misses

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

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

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

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

Questions