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Thread: Ubuntu doesn't have all memory available

  1. #1
    Join Date
    Jan 2008
    Beans
    130
    Distro
    Ubuntu 16.04 Xenial Xerus

    Ubuntu doesn't have all memory available

    I bought a new computer a few days ago, and the system is not seen the 16gb of ram.

    On /proc/meminfo the kernel get the 16gb but the free command report only 8gb.

    I'm using the 64 bit installation.

    Has someone the same problem?


    cat /proc/meminfo
    *-memory
    description: System Memory
    physical id: 27
    slot: System board or motherboard
    size: 16GiB
    *-bank:0
    description: DIMM Synchronous [empty]
    product: Array1_PartNumber0
    vendor: A1_Manufacturer0
    physical id: 0
    serial: A1_SerNum0
    slot: A1_DIMM0
    *-bank:1
    description: DIMM DDR3 Synchronous 667 MHz (1.5 ns)
    product: Array1_PartNumber1
    vendor: A1_Manufacturer1
    physical id: 1
    serial: A1_SerNum1
    slot: A1_DIMM1
    size: 8GiB
    width: 64 bits
    clock: 667MHz (1.5ns)
    *-bank:2
    description: DIMM Synchronous [empty]
    product: Array1_PartNumber2
    vendor: A1_Manufacturer2
    physical id: 2
    serial: A1_SerNum2
    slot: A1_DIMM2
    *-bank:3
    description: DIMM DDR3 Synchronous 667 MHz (1.5 ns)
    product: Array1_PartNumber3
    vendor: A1_Manufacturer3
    physical id: 3
    serial: A1_SerNum3
    slot: A1_DIMM3
    size: 8GiB
    width: 64 bits
    clock: 667MHz (1.5ns)


    cat /proc/meminfo
    MemTotal: 8148280 kB

    uname -a -> Linux alphaprime 3.2.0-32-generic #51-Ubuntu SMP Wed Sep 26 21:33:09 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

    Thanks.

  2. #2
    Join Date
    Oct 2006
    Location
    Canada
    Beans
    143
    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: Ubuntu doesn't have all memory available

    Hi fmsismo.


    Similar problem but no solution i'm aware of:

    http://ubuntuforums.org/showthread.php?t=2074898

    mardybear

  3. #3
    Join Date
    Jul 2011
    Beans
    3,037
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Ubuntu doesn't have all memory available

    Did you run memtest to verify that the RAM is working correct? It may be physically installed, but that doesn't mean that it couldn't be damaged. When running memtest, let it run for at least two complete iterations.
    Can you post the output from the free command?

  4. #4
    Join Date
    Jan 2008
    Beans
    130
    Distro
    Ubuntu 16.04 Xenial Xerus

    Re: Ubuntu doesn't have all memory available

    free
    total used free shared buffers cached
    Mem: 8148252 8006592 141660 0 95924 5023336
    -/+ buffers/cache: 2887332 5260920
    Swap: 17571836 0 17571836


    Already chequed the memory seems to be ok.

  5. #5
    Join Date
    Jun 2007
    Beans
    12,682

    Re: Ubuntu doesn't have all memory available

    Things to try:
    - Check dmesg
    - Try the RAM in different slots
    - Try a newer kernel

    If the RAM was faulty, it would probably still be recognized, but the problem would show up as random freezing (or not show up at all).

  6. #6
    Join Date
    Jan 2008
    Beans
    130
    Distro
    Ubuntu 16.04 Xenial Xerus

    Re: Ubuntu doesn't have all memory available

    If I use the ram in slots without dual channel the systems see and can use the 16gb, if I set the system to use the dualchannel it's only get 8 gb to use. I test all banks with both memories, all of them ok.

    Thanks for your time!
    Last edited by fmsismo; October 28th, 2012 at 12:53 PM. Reason: Didn't say thanks

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