Remember that `cat /proc/cpuinfo` will show you all logical processors.
So with dual core CPU's you'll see twice the amount of processors.
x86info is another utility you could use to view info on the physical cpu (also if hyper threading is enabled)
As I remember, we have to install the rpm from the Redhat media & Suse media. (Not available by default on my Slackware machines)
"If you always do what you've always done, you will always be where you've always been."