Author: Johan de Koning
Date: 18:21:32 08/26/03
Go up one level in this thread
On August 26, 2003 at 11:42:03, Robert Hyatt wrote:
>On August 26, 2003 at 03:00:52, Johan de Koning wrote:
>
>>On August 25, 2003 at 18:04:29, Robert Hyatt wrote:
>>
>>>A single cpu that will run crafty at 1M nps has a cache-cache and cache-memory
>>>bandwidth of X bytes/second. A single cpu that runs crafty at 2M nps has
>>>exactly twice the cache-cache and cache-memory bandwidth and twice the clock
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>>>frequency. A dual-cpu just needs two cpus, but the two cpus give twice the
>>>cache-cache bandwidth, but _no_ improvement in cache-memory bandwidth.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>>Nope, C2M bandwith is constant, regardless of n and f (hence constant :-).
>
>Actually it isn't. Some duals use interleaving. Some don't. All quads I
>have here use 4-way interleaving to ramp up the bandwidth significantly.
You're actually helping me to invalidate the comparison above.
Now it is not just FALSE, it is even -TRUE. :-)
... Johan
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