Messages in this thread | | | Date | Wed, 20 Jun 2001 13:42:21 -0600 | From | Charles Cazabon <> | Subject | Re: Threads FAQ entry incomplete |
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Rodrigo Ventura <yoda@isr.ist.utl.pt> wrote: > > BTW, I have a question: Can the availability of dual-CPU boards for intel > and amd processors, rather then tri- or quadra-CPU boards, be explained with > the fact that the performance degrades significantly for three or more CPUs? > Or is there a technological and/or comercial reason behind?
Commercial reasons. Cost per motherboard/chipset goes way up as the number of CPUs supported goes up. For each CPU that a chipset supports, it has to add a lot of pins/lands, and chipsets are already typically land-limited. Motherboard trace complexity (and therefore number of layers) goes up. Add to that that the potential market goes down as CPUs goes up.
You can buy 4-, 8-, and 16-way motherboards for Intel CPUs (don't know about more). But the 16-way ones will cost as much as a house.
Charles -- ----------------------------------------------------------------------- Charles Cazabon <linux@discworld.dyndns.org> GPL'ed software available at: http://www.qcc.sk.ca/~charlesc/software/ Any opinions expressed are just that -- my opinions. ----------------------------------------------------------------------- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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