PAE (Physical Address Extension) Support

configname: CONFIG_X86_PAE

Linux Kernel Configuration
└─>Processor type and features
└─>PAE (Physical Address Extension) Support
In linux kernel since version 2.6.12  
PAE is required for NX support, and furthermore enables
larger swapspace support for non-overcommit purposes. It
has the cost of more pagetable lookup overhead, and also
consumes more pagetable space per process.