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HomePage > ComponentHowTo Components and HowTos > Storage Memory and Storage
PAE (Physical Address Extention)
Physical Address Extension (PAE) is a feature to allow (32-bit) x86 processors to access a physical address space larger than 4 gigabytes. This includes RAM {Random Access Memory} and memory mapped devices.
Sometimes referred to as PAE-Highmem.
When to use a PAE version of Puppy
If the (32-bit) computer has-
- more than 4GB RAM, then the PAE version is required to be able to access the whole memory.
- 4GB or less RAM, then using the PAE version may be still possible/desirable. This is because of the No Excute feature (see below). Note, however, there may be a performance penalty using PAE (see Related Webpages).
Puppy Version
There are versions of Puppy Linux that have a PAE version available, including Puppy53 Slacko and PrecisePuppy.
No Excute
PAE is not only more physical address space but also important for the "no execute" feature which disables execution of code that is marked as non-executable.
Compatibility
PCs MUST have PAE to boot a PAE distro. PAE is built into the system's CPU. Non PAE compatible processors include some of the Intel Atom range.
Not all applications are compatible with PAE.
Compiling the Kernel
For advance users compiling there own kernel configuration. There can be chosen one of these three SYMBOLS (kernel 3.4.9S)
Symbol: NOHIGHMEM
If you are compiling a kernel which will never run on a machine with more than 1 Gigabyte total physical RAM, answer "off" here (default choice and suitable for most users). Very Happy
Symbol: HIGHMEM4G
Select this if you have a 32-bit processor and between 1 and 4 gigabytes of physical RAM.
Symbol: HIGHMEM64G
Select this if you have a 32-bit processor and more than 4 gigabytes of physical RAM.
