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Technology Stocks : Advanced Micro Devices - Moderated (AMD)
AMD 221.06-1.1%3:59 PM EST
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To: eCo who wrote (67442)1/9/2002 6:22:18 PM
From: Gopher BrokeRead Replies (1) of 275872
 
These SMT/SMP numbers are surprising. Look at the Dhrystone scores for the 1.8 GHz Prestonia.

All options enabled
2 x Prestonia .................8037 MIPS
SMT only (SMP disabled)
1 x Prestonia .................6688 MIPS
SMP and SMT disabled
1 x Prestonia .................3388 MIPS
SMP only (SMT disabled)
2 x Prestonia .................4425 MIPS


The Prestonia gains a staggering 97% (3388->6688) when SMT is enabled on a uniprocessor system but only 32% (3388->4425) for a dual SMP system where SMT is disabled. For that kind of increase when just enabling SMT, in the non SMT version the processor must be stalled for a huge percentage of the time (>>50%). And presumably the relatively small gain for the dual processor system is because the FSB is overloaded trying to feed a single processor so there is little benefit in adding a second.

But the regular XEON 1.6 shows a 100% gain when a second (presumably non SMT) processor is added? Something just doesn't look right with these numbers. Why would anyone buy a dual Prestonia Xeon when it only performs 20% faster than a single Prestonia Xeon (6688->8037)?

Anyone got any explanations for these strange numbers?
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