Messages in this thread | | | Date | Wed, 11 Jun 2003 09:52:38 -0700 | From | William Lee Irwin III <> | Subject | Re: [PATCH 2/2][2.5]Unisys ES7000 platform subarch |
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On Wed, Jun 11, 2003 at 11:40:05AM -0500, Protasevich, Natalie wrote: > Clustering on ES7000 follows Intel guidelines, but not quite fall into > certain cluster model category. According to Intel book, cluster can be flat > (on the same bus) or hierarchical (physically separate bus segments). Flat > cluster uses serial bus messaging (like on xAPIC systems) and can support 15 > agents. On both APIC models that ES7000 utilizes, it can support 32 > processors (with xAPICs, 64 hypothreaded P4's, if only OS could support > that). It has special arrangement for the APIC buses and corresponding > numbering for APICs, which reflects its topological nature, so the > conventional APIC cluster numbering schema won't work. Due to those > differences, our clusters are not that "flat", and we call it "physical", > and "logical" really means "hierarchical". I think, our cluster model names > came from some previous distributions that implemented both models, I swear > I didn't invent it myself. They just worked for our case.
This nomenclature has also been used by other large i386 system vendors besides Unisys, e.g. Sequent.
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