书上说enterprise核心支持大内存（>4G），smp核心支持多处理器
那么,既要支持大内存（>4G），又要支持多处理器应该用什么核心？
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Choosing a Kernel
The Linux installers tend to make good choices about which kernel to install, and install the kernel
that uses your hardware and gives a good performance. If you have to choose which kernel to use,
follow these guidelines.
For machines with more than 4 GB of physical memory, an enterprise kernel is required. The
enterprise kernel includes the Physical Address Extensions (PAE) that are required to address
more than 4 GB of physical memory. This includes a three-level memory page table, so if you
have less than 4 GB of physical RAM, then the three-level page table is an extra overhead that is
not required.
For multiprocessor machines, the installer chooses an smp kernel. The smp kernel has the
required extensions to handle scheduling processes on more than one CPU.
The uniprocessor kernel handles up to 4 GB of physical memory ona single processor. An
example of the uniprocessor name is 2.4.9-e.3. (Note that there is no special designator.)
An enterprise or smp kernel may be used on a uniprocessor machine, but has extra overhead
associated with the unused features.
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