Discontigious Memory

configname: CONFIG_DISCONTIGMEM_MANUAL

Memory model
└─>Discontigious Memory
In linux kernel since version 2.6.13 (release Date: 2005-08-28)  
This option provides enhanced support for discontiguous
memory systems, over FLATMEM. These systems have holes
in their physical address spaces, and this option provides
more efficient handling of these holes. However, the vast
majority of hardware has quite flat address spaces, and
can have degraded performance from extra overhead that
this option imposes.

Many NUMA configurations will have this as the only option.

If unsure, choose "Flat Memory" over this option.