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To: Win Smith who wrote (40885)5/22/2001 3:01:10 PM
From: dougSF30Read Replies (2) | Respond to of 275872
 
Win, it's not just P4 Xeons that exhibit the weird linpack ringing.

Inquest's stuff showed it too, on regular P4s, which they attribute to throttling, but in retrospect is almost certainly not.

But *some* P4 benches, like that older Anand one, show a smooth curve.

So, as someone on here (you?) suggested earlier, perhaps a stepping screwed something up?

Doug



To: Win Smith who wrote (40885)5/22/2001 4:08:43 PM
From: Ali ChenRespond to of 275872
 
Win, "the odd P4 Xeon linpack graph"

It certainly looks like this particular CPU
implementation does not like certain sizes of
data blocks, which apparently leads to severe
cache trashing.

Regards,
- Ali


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