power aware hardware prefetching
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Power-Aware Hardware Prefetching. Yao Guo. Prefetching Energy Consumption. L2 + Memory Access Energy very minor energy impact. Leakeage Energy reduced due to performance improvement L1 Access energy increased significantly. Prefetching Energy Consumption. Cache Way-Prediction.

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Presentation Transcript
prefetching energy consumption
Prefetching Energy Consumption
  • L2 + Memory Access Energy
    • very minor energy impact.
  • Leakeage Energy
    • reduced due to performance improvement
  • L1 Access energy
    • increased significantly.
cache way prediction
Cache Way-Prediction
  • ISLPED’99, Inoue et al.
  • MRU (Most Recently Used Way)
    • Remember the MRU way for each cache set.
prefetching tag buffer ptb
Prefetching Tag Buffer (PTB)
  • Use a small hardware buffer (PTB) to remember the most recently prefetched cache tags.
    • No prefetching if data is found in PTB.
    • Use LRU algorithm when the buffer is full.
  • Energy cost is small.
    • Access the buffer only during prefetching
    • Buffer is much smaller compared to MRU.
how does ptb work
How does PTB work?

Prefetching Request

  • A prefetching request is dropped if found in the PTB.

PTB

Hit

Prefetching

Dropped

Miss

DL1

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