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#151
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Yousuf Khan wrote:
Rob Stow wrote: Newisys was bought up by Appro. Wasn't it Sanmina-SCI? Yousuf Khan Keith said the same thing earlier, to which I replied: You are right: http://www.newisys.com/about_us/index.html |
#152
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On Thu, 24 Mar 2005 07:04:09 -0500, Yousuf Khan wrote:
keith wrote: Opteron is 8-way capable today, but the mechanics get a little problematic. There is no reason to assume that a dual-Opteron can't reach 8-way on a 4-W board. If you're thinking of a 16P system, AIUI, it's not going to happen. There would have to be changes to the coherent HT links for that to happen. I don't see it, but... Or an external chipset, like Horus, or Serverworks/Sun's new chipset. Okay, but we aren't talking about the same thing anymore. AIUI, the AMD NUMA architecture is sufficiently UMA to be UMA as long as the local interconnects (hypertransport) are used. Once another bridge is used, this breaks down and we really have a NUMA system. No? -- Keith Yousuf Khan |
#153
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keith wrote:
Or an external chipset, like Horus, or Serverworks/Sun's new chipset. Okay, but we aren't talking about the same thing anymore. AIUI, the AMD NUMA architecture is sufficiently UMA to be UMA as long as the local interconnects (hypertransport) are used. Once another bridge is used, this breaks down and we really have a NUMA system. No? Well, even if they used bog-standard Hypertransport to try and go beyond 8P, they may find that the number of hops makes a difference to the latency that would take it outside of the domain of Sufficiently UMA. However, there is some talk that the next generation Opterons will be able to connect to 32-processors all by itself. That would likely indicate that AMD is planning to increase the number of external HTT channels per processor. Yousuf Khan |
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