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Appendix C. Troubleshooting Your Installation of Red Hat Enterprise Linux
C.4.6. 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
Find out if 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
mem=xxM
Replace xx with the amount of RAM you have in megabytes.
In
/boot/grub/grub.conf
#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 (2.4.21-1.1931.2.399.ent)
root (hd0,0)
kernel /vmlinuz-2.4.21-1.1931.2.399.ent ro root=/dev/hda3 mem=128M
Once you reboot, the changes made to
Or, you can add the following line to the
append="mem=xxM"
Note, that the
append
Replace xx with the amount of RAM you have in megabytes. Remember that per-image append
lines completely overwrite the global append line. It might be worth adding this to the per-image
descriptions.
In
/etc/lilo.conf
boot=/dev/sda
map=/boot/map
install=/boot/boot.b
prompt
timeout=50
image=/boot/vmlinuz-2.4.21-1.1931.2.399.ent
label=linux
root=/dev/sda1
initrd=/boot/initrd-2.4.21-1.1931.2.399.ent.img
read-only
append="mem=128M"
Remember to run
/sbin/lilo -v
Note that you can also produce the same effect by actually passing this option when you are specifying
the label/image to use in GRUB or LILO.
Once you have loaded the GRUB boot screen, type
in the configuration file for the boot label you have selected.
Choose the line that starts with
At the end of the
kernel
mem=xxM
command.
, the above example would look similar to the following:
grub.conf
/etc/lilo.conf
command works in both GRUB and LILO.
, the above example would look similar to the following:
after changing
and type
kernel
line, add
/boot/grub/grub.conf
will be reflected on your system.
file:
/etc/lilo.conf
for edit. You are presented with a list of items
e
to edit this boot entry.
e
:
.
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