kernel vs kernel-PAE? why yum install kernel does not install kernel-PAE automatically?

[Kevin Kofler]

Kam Leo wrote:
> The short answer is you do not need PAE. Your 3GB is within the
> address range of the "standard" 32-bit kernel.

Well, the non-PAE kernel can only address 3 GB of userspace memory, 1 GB is
reserved for the kernel. He has slightly more than 3 GB, so PAE might be
beneficial.

Another reason to use PAE is that you get better protection about arbitrary
code execution exploits from stack overflows if your CPU supports the "NX
bit" (it can only be used with PAE or x86_64).

        Kevin Kofler