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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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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