In Windows 32 bit I have the /pae option to use up to 4 GB of RAM for example as a ram disk. Can I configure Linux 32 bit the same way? What option do I need to select in the kernel config menu to enable /pae? When I start top in Linux 32 bit I can only see a total of 2 GB of ram? Does Linux uses up to 4 GB when I install the 64 bit version?
You need to install and boot the PAE kernel. If you are using Red Hat or one of it's derivatives,
If the RPM doesn't do it for you, you'll want to set the default grub entry to the PAE kernel in