Just upgraded to 4Go or more ram? Install and enable PAE Kernel | Ubuntu & Fedora RHEL Centos

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Did you upgrade your computer to a 4 GB or more RAM? Do you have a 32bit system? If yes, then your machine may not show up total 4Go, in this case you need to use the Linux kernel compiled for PAE capable machines.

What is PAE?

The PAE package includes a version of the Linux kernel with support for up to 64GB of high memory. It requires a CPU with Physical Address Extensions (PAE). First check if your processor supports PAE :

cat /proc/cpuinfo | grep -i PAE

Output (In my case):

zinovsky@zinovsky:~$ cat /proc/cpuinfo | grep -i PAE

flags        : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe lm constant_tsc arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl est tm2 ssse3 cx16 xtpr pdcm lahf_lm
flags        : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe lm constant_tsc arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl est tm2 ssse3 cx16 xtpr pdcm lahf_lm

Installing PAE in Ubuntu:

If you had 4 Go or more memory before to install Ubuntu 10.04 and above then you don`t need to do anything since ubuntu automatically installs the PAE enabled kernel if it detects more than 3 Gb of available memory. In the case of the liveCD, a working network connection is required, since the PAE enabled kernel packages are not present on the CD.

If you have Ubuntu 10.10 already installed and you just upgraded your Ram to 4Go or more, then you need to install PAE kernel. To do that open terminal and type the following command :

sudo aptitude install linux-generic-pae linux-headers-generic-pae

After the new kernel is installed you need to reboot your computer. PAE kernel should be booted as the default option in the GRUB boot menu.

Installing PAE in Fedora/RHEL/CentOS:

For fedora /RHEL and CentOS open terminal and Run the following command :

yum install kernel-PAE

Then

Reboot

Now PAE kernel should be booted as the default option in the GRUB boot menu.

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Usefull Links : https://help.ubuntu.com

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