Ist SMP bei dir aktiviert?
2.1.5. Multiple Processors
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In order to take advantage of multiple processors, you should check to see if a kernel package that supports SMP is installed, and if not, choose an appropriate kernel package. You can also build your own customized kernel to support SMP. You can find a discussion of how to do this in Section 8.5, “Compiling a New Kernel”. At this time (kernel version 2.4.27) the way you enable SMP is to select ``symmetric multi-processing'' in the ``General'' section of the kernel config.
Quelle:
http://www.debian.org/releases/stable/i3…ml.en#id2530455