Is Your RAM Not Being Recognized?

Sometimes, the kernel does not recognize all of your memory (RAM). You can
check this with the cat /proc/meminfo command. Verify that the displayed
quantity is the same as the known amount of RAM in your system. If they are
not equal, add the following line to the /boot/grub/grub.conf:

  • mem=xxM
Replace xx with the amount of RAM you have in megabytes. In
/boot/grub/grub.conf, the above example would look similar to the following:

# NOTICE: You have a /boot partition. This means that
# all kernel paths are relative to /boot/
default=0
timeout=30
splashimage=(hd0,0)/grub/splash.xpm.gz
title Red Hat Enterprise Linux (2.6.9-5.EL)
root (hd0,0)
kernel /vmlinuz-2.6.9-5.EL ro root=/dev/hda3 mem=128M

Once you reboot, the changes made to grub.conf are reflected on your system.
Once you have loaded the GRUB boot screen, type e for edit. You are presented
with a list of items in the configuration file for the boot label you have selected.

Choose the line that starts with kernel and type e to edit this boot entry. At the
end of the kernel line, add
  • mem=xxM
where xx equals the amount of RAM in your system. Press Enter to exit edit
mode. Once the boot loader screen has returned, type b to boot the system.

Itanium users must enter boot commands with elilo followed by the boot
command. Remember to replace xx with the amount of RAM in your system.
  • Press Enter to boot.

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