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CONFIG_NOHIGHMEM:                                                                                     x   
  x                                                                                                       x   
  x Linux can use up to  64  Gigabytes of physical memory on x86 systems.                                   x   
  x However, the address space of  32 -bit x86 processors is only  4                                          x   
  x Gigabytes large. That means that, if you have a large amount of                                       x   
  x physical memory, not all of it can be  "permanently mapped"  by the                                     x   
  x kernel. The physical memory that's not permanently mapped is called                                   x   
  x "high memory".                                                                                        x   
  x                                                                                                       x   
  x If you are compiling a kernel which will never run on a machine with                                  x   
  x more than 960 megabytes of total physical RAM, answer "off" here (default                             x   
  x choice and suitable for most users). This will result in a "3GB/1GB"                                  x   
  x split: 3GB are mapped so that each process sees a 3GB virtual memory                                  x   
  x space and the remaining part of the 4GB virtual memory space is used                                  x   
  x by the kernel to permanently map as much physical memory as                                           x   
  x possible.                                                                                             x   
  x                                                                                                       x   
  x If the machine has between 1 and 4 Gigabytes physical RAM, then                                       x   
  x answer "4GB" here.                                           

x If more than 4 Gigabytes is used then answer "64GB" here. This                                        x   
  x selection turns Intel PAE (Physical Address Extension) mode on.                                       x   
  x PAE implements 3-level paging on IA32 processors. PAE is fully                                        x   
  x supported by Linux, PAE mode is implemented on all recent Intel                                       x   
  x processors (Pentium Pro and better). NOTE: If you say "64GB" here,                                    x   
  x then the kernel will not boot on CPUs that don't support PAE!                                         x   
  x                                                                                                       x   
  x The actual amount of total physical memory will either be auto                                        x   
  x detected or can be forced by using a kernel command line option such                                  x   
  x as  "mem=256M" . (Try  "man bootparam"  or see the documentation of your                                  x   
  x boot loader (grub, lilo or loadlin) about how to pass options to the                                  x   
  x kernel at boot time.)                                                                                 x   
  x                                                                                                       x   
  x If unsure, say  "off" .