Re: Not all logical processors activated on Dual Core Xeon (== no Hyperthreading)
From: Andi Kleen
Date: Wed Jan 09 2008 - 10:26:00 EST
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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