How to install PAE kernel on CentOS

When you have 4GB or more memory and you have a 32-bit kernel running, your machine will be limited to use around 3GB of memory. All you have to do is install PAE kernel package.

1. Install the PAE kernel package:

# yum install kernel-PAE

2. Check your grub menu list, the ‘default’ value should be set to the PAE kernel.

3. Reboot:

# shutdown -r now