Victim Caching

• VC useful in case of conflict misses, long sequential reference streams. Prevent sharp fall off in performance when WSS is slightly larger than L1.

• Estimate WSS from the structure of the RM such as the size of the strongly connected components (SCCs)

• MORPH data-path structure supports addition of a parameterized victim/stream cache. The control logic is synthesized using CAD tools.

• Victim caches provide 50X the marginal improvement in hit rate over the primary cache.

mux

tag

v

one line

addr

data

addr

FA

data

MRU

Small (1-5 lines)

fully-associative

cache configured as

victim/stream cache

or stream buffer.

+1

Direct

mapped

L1, L2

victim line

new line

tags

tags

to stream buffer

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