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Technology Stocks : Intel Corporation (INTC)
INTC 35.53-1.1%Nov 14 3:59 PM EST
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To: Scumbria who wrote (72305)1/28/1999 12:11:00 AM
From: vegetarian  Read Replies (1) of 186894
 
>> A larger cache does almost nothing to improve bandwidth. It only increases the hit rate. The bandwidth is determined by the amount of data which can be moved in/out of the cache per clock, and is a function of the datapath.<<

Bandwidth is usually measured as data transfer rate to the core in bytes/sec; if the hit rate to the cache increases more bytes per seond are transferred from the cache because cache is a faster memory than the levels of mem hierarchies further down. So although, one might be tempted to think of a cache memory only as a reducer of effective latency, it does significantly increase the bandwidth as well. Usually the bandwidth of interest for CPU is Bandwidth available to the CPU core. IN your definition above you say that the bandwidth is amount of data which can be moved in/out of cache and you also say that it is independent of hit rate which is contradictory because the data can be moved in/out of cache faster if it is found in the cache.

>>I would love to comment in detail about this, but one of my basic SI tenets is to not discuss any projects I have worked on. Let's just say, I disagree "strongly" with your assertion.<<

Most of the major processor manufacturers I know of have a group (or more) doing performance simulations, however , it would not surprise me if some folks didn't and designed by gut, but they would not last very long in the performance wars.
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