让32位到linux支持高达64G到内存-PAE
转自http://www.jonboy60.com/2011/01/20/howto-install-kernel-pae/
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The Linux kernel with support for up to 64GB of high memory. It
requires a CPU with Physical Address Extensions (PAE). Physical Address
Extension (PAE) is a feature to allow x86 processors to access a
physical address space (including random access memory and memory mapped
devices) larger than 4 gigabytes. The non-PAE kernel can only address
up to 4GB of memory. Install the kernel-PAE package if your machine has
more than 4GB of memory.
Do your computer had more than 4GB RAM? 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 Linux need to use
the Linux kernel compiled for PAE capable machines. 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).
Checking Processor
$ cat /proc/cpuinfo | grep -i PAE
(If you see pae, then your processor supports PAE)
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.
Installing PAE in Ubuntu
If you had 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 3GB 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
Then
Reboot
Now PAE kernel should be booted as the default option in the GRUB boot menu.
