Author: Gian-Carlo Pascutto
Date: 23:32:40 11/12/03
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On November 12, 2003 at 23:22:53, Aaron Gordon wrote: >So, are you saying it needs special NUMA code to get 'full' bandwidth and that >it defaults to a single memory channel? Running Windows 2k, XP, and other SMP >operating systems the Opteron *always* gets the full memory bandwidth across >all of its cpus. Hardware test pages ran all kinds of reviews/tests and every >single one showed a dual/quad pulls a ridiculous amount of bandwidth. Remove >the chips and it goes back down accordingly. Such a test doesn't necessarily paint the whole picture. I think that Crafty basically shows while Opteron is a great processor, it's still best to shy away from it's worst case situations, or you might get suboptimal results. >This looks like a Crafty problem, NOT an Opteron problem. Why test software >that already has problems? Those speedup numbers for 2 cpus are identical to >the dual Athlon numbers.. which crafty also had problems with. Try Deep Sjeng >for example, see how that turns out. I'm sure Gian would send it to you for >speed-testing most likely if you don't have it already. I'd be willing to bet >the Opteron mops up the Xeons as I mentioned before. Want to give it a shot, at >least until Crafty is working properly? Already did that, Deep Sjeng _flies_ on (Quad) Opterons, but the design is very different from Crafty. -- GCP
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