Re: Not all logical processors activated on Dual Core Xeon (== no Hyperthreading)

[Andi Kleen]

VUB Stefan Seidel <sseidel@xxxxxx> writes:

> I have the following system here: two dual-core Xeon 5130 on an Intel
> S5000V-SA motherboard. The kernel detects 4 CPUs, from what I learn
> through /proc/cpuinfo, these are the 4 cores (two per
> package). However, I think it should be 8 logical processors, because
> the Xeons should be able to do Hyperthreading (or

Core2 Duo based Xeons do not support Hyper Threading.

> ===========================
> but acpidump shows 8 CPUs in multiple locations:

That's likely because the BIOS supports Quad Core CPUs, but does
not disable the excessive objects if you only plug in Dual Core

-Andi
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