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Possible Duplicate:
Why does Ubuntu only show 3GB of RAM?

My Ubuntu install is no using 100% of the memory installed.

lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 12.10
Release:        12.10
Codename:       quantal

#sudo lshw -short
H/W path        Device      Class       Description
                            system      Computer
/0                          bus         D915GVWB
/0/0                        processor   Intel(R) Pentium(R) 4 CPU 3.60GHz
/0/0/1                      memory      16KiB L1 cache
/0/0/2                      memory      2MiB L2 cache
/0/3                        memory      64KiB BIOS
/0/12                       memory      4GiB System Memory
/0/12/0                     memory      1GiB DIMM DDR Synchronous 400 MHz (2.5 ns)
/0/12/1                     memory      1GiB DIMM DDR Synchronous 400 MHz (2.5 ns)
/0/12/2                     memory      1GiB DIMM DDR Synchronous 400 MHz (2.5 ns)
/0/12/3                     memory      1GiB DIMM DDR Synchronous 400 MHz (2.5 ns)

#cat /proc/meminfo
MemTotal:        3073396 kB

#free -m
             total       used       free     shared    buffers     cached
Mem:          3001        993       2008          0         50        529
-/+ buffers/cache:        413       2588
Swap:         3060          0       3060

Htop displays 3001MB as well.

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marked as duplicate by Anwar Shah, January, Mitch, Tom Brossman, jokerdino Oct 13 '12 at 0:16

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

64 Bit Kernal installed... uname -m x86_64 – Dave Stewart Oct 12 '12 at 17:58
Then this might not be a duplicate, since you have 64bit installed. – Anwar Shah Oct 12 '12 at 18:04
What video card are you using? – Nikki Kononov Oct 12 '12 at 18:09

If you are booting using standard BIOS, maybe the BIOS e820 memory map is lying to the kernel. The kernel has to trust what the firmware tells it when it comes to memory layout. To see what you have use:

dmesg | grep e820

alternatively, one can look at the entries in /sys/firmware/memmap, but these are a little tricky to read, so one could use:

sudo apt-get install fwts
sudo fwts memmapdump -
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