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Politics : Formerly About Advanced Micro Devices
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To: Petz who wrote (115633)6/12/2000 8:02:00 PM
From: pgerassi  Read Replies (1) of 1576246
 
Dear John:

The problem with the higher latency scores are due to the use of exclusive cache. The upside is that you are not duplicating the contents but, the downside is you have to write back the L1 cache victims. This doubles the apparent latency and halves the apparent bandwidth, but on most programs the L1 cache hit rate will cover the L2 latency completely. All it takes is about five or six successive hits to the L1 caches for the underlying L2 latency to disappear. The testing programs used are a "corner" case rarely seen in general code.

Pete
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