Finally got around to configuring my debian installation kernels! Now using all my cpus and memory. :-)
SMP = multiple processors
Highmem / Bigmem = 900MB+ / 4GB+ / 16GB+?
I have 12GB in one of my machines now. :-)
In case you were wondering “what does smp mean?”:
SMP stands for symmetric multi-processors, aka dual or quad processors (or more!). But if you were buying a machine with more than 4 processors, you’d likely know what SMP meant!