Ubuntu not seeing all memory installed

[sim085]

Hello,

I just upgraded from 2GB of ram to 4GB of ram. Before upgrade /proc/meminfo MemTotal reported "2049900 kB" which is around 2GB. After upgrade, /proc/meminfo MemTotal only reports "3340144 kB". This is only around 3.34GB.

I have Ubuntu Server 64bit installed so I was expecting to see 4GB of ram. When I enter "uname -a" I get the following: "Linux data 3.13.0-36-generic #63-Ubuntu SMP Wed Sep 3 21:30:07 UTC 2014 x86_6486_64 x86_64 GNU/Linux"

The command "lscpu" returns that my CPU is "Architecture: x86_64".

I cannot understand why only 3.3GB of memory is being seen by Ubuntu.

[sim085]

When I enter the command "sudo lshw -class memory" I get the following result:

  *-firmware
       description: BIOS
       vendor: Award Software International, Inc.
       physical id: 0
       version: F9
       date: 12/05/2005
       size: 128KiB
       capacity: 448KiB
       capabilities: isa pci pnp apm upgrade shadowing cdboot bootselect socketedrom edd int13floppy360 int13floppy1200 int13floppy720 int13floppy2880 int5printscreen int9keyboard int14serial int17printer int10video acpi usb ls120boot zipboot biosbootspecification
  *-cache:0
       description: L1 cache
       physical id: b
       slot: Internal Cache
       size: 128KiB
       capacity: 128KiB
       capabilities: synchronous internal write-back
  *-cache:1
       description: L2 cache
       physical id: d
       slot: External Cache
       size: 512KiB
       capacity: 512KiB
       capabilities: synchronous internal write-back
  *-cache
       description: L1 cache
       physical id: c
       slot: Internal Cache
       size: 128KiB
       capacity: 128KiB
       capabilities: synchronous internal write-back
  *-memory:0
       description: System Memory
       physical id: 1b
       slot: System board or motherboard
       size: 3261MiB
     *-bank:0
          description: DIMM 166 MHz (6.0 ns) [empty]
          physical id: 0
          slot: A0
          width: 64 bits
          clock: 166MHz (6.0ns)
     *-bank:1
          description: DIMM 166 MHz (6.0 ns) [empty]
          physical id: 1
          slot: A1
          width: 64 bits
          clock: 166MHz (6.0ns)
     *-bank:2
          description: DIMM 166 MHz (6.0 ns) [empty]
          physical id: 2
          slot: A2
          width: 64 bits
          clock: 166MHz (6.0ns)
     *-bank:3
          description: DIMM 166 MHz (6.0 ns) [empty]
          physical id: 3
          slot: A3
          width: 64 bits
          clock: 166MHz (6.0ns)
  *-memory:1 UNCLAIMED
       description: Memory controller
       product: CK804 Memory Controller
       vendor: NVIDIA Corporation
       physical id: 4
       bus info: pci@0000:00:00.0
       version: a3
       width: 32 bits
       clock: 66MHz (15.2ns)
       capabilities: ht bus_master cap_list
       configuration: latency=0

What does the last part mean? "*-memory:1 UNCLAIMED"?

[Mike_Walsh]

Hallo, Sim.

Have a look at this page:-

http://www.linuxatemyram.com/

It may answer your question! Apparently, Linux utilises your memory in a rather different way to *******...

Regards,

Mike.

[sim085]

That article seems to speak about free memory. My problem is with total memory. When I had 2GB MemTotal reported I had 2GB. Now that I have 4GB, MemTotal reports I have 3.3GB.

[nerdtron]

I don't think this is about swap. It's about the memory reported not reaching 4GB.

Do you have a Graphics card?
Try removing it first, reboot while using the onboard video. See if memory displayed on /proc/meminfo reaches 4GB. Then try reboot again with the graphics card installed.

[sandyd]

Also, are you using some kind of Intel CPU - an amount of memory is allocated to the integrated Intel HD Graphics.

For example, on my 8G laptop,

MemTotal:        7895476 kB

[sim085]

Yes I have a graphics card. The motherboard does not have on board video card. Wouldn't that mean that Video Card would use the memory on the video card itself?

[sim085]

No, this is AMD. The motherboard is this one; GA-K8NXP-SLI

[sotiris2]

What is your cpu ? It is possible that it does have integrated graphics and maybe it reserves some memory for that even though you have an discrete graphics card installed.

Modern AMD is just as likely to have graphics as Intel.

[nerdtron]

Wouldn't that mean that Video Card would use the memory on the video card itself?

Nope, the video card will have it's own memory so all ram will be given to the OS.

you sure you don't have on board video? Most computer will have a vga, dvi o hdmi port to a monitor.

What is the specs of your server?