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Thread: Memory Upgrade- Memory Not Being Used?

  1. #1
    Join Date
    Mar 2010
    Beans
    19
    Distro
    Ubuntu 9.10 Karmic Koala

    Memory Upgrade- Memory Not Being Used?

    Hi:
    I just upgraded my memory from 1GB to 4GB. For some reason the system is only reporting 2.8GB total:

    noleks-ub:~> free -m
    total used free shared buffers cached
    Mem: 2770 1321 1448 0 169 571
    -/+ buffers/cache: 580 2190
    Swap: 2557 0 2557


    Has anyone else seen this? I read something about reconfiguring the kernel to use more memory, but I'm not sure whether the Update Manager can adapt to the new physical memory available, or whether I need to tweak and rebuild the kernel myself?
    If the latter is the case, I then would have a couple additional questions:
    1) What is the working directory for a kernel build, for instance I don't know the difference here in /usr/src:
    drwxr-xr-x 24 root root 4096 2011-03-30 23:25 linux-headers-2.6.32-30
    drwxr-xr-x 7 root root 4096 2011-03-30 23:26 linux-headers-2.6.32-30-generic
    2) If I run make menuconfig or whatever, will the settings used for the previous kernel build be maintained (ie I can tweak just what I need to tweak)?

    Thanks!

  2. #2
    Join Date
    Jun 2007
    Beans
    11,026

    Re: Memory Upgrade- Memory Not Being Used?

    This is expected behavior for a 32-bit system (also looks like you have some memory going to onboard video). Install 64-bit distro or use PAE: https://help.ubuntu.com/community/EnablingPAE

  3. #3
    Join Date
    Mar 2010
    Beans
    19
    Distro
    Ubuntu 9.10 Karmic Koala

    Re: Memory Upgrade- Memory Not Being Used?

    Uh-oh...
    Well it looked like everything was going swimmingly until I rebooted. I installed pae headers and it looks like it rebuilt the kernel. But now I get this:

    Ubuntu 10.04.2 LTS noleks-ub tty1

    noleks-ub login: [ 24.540101 cx25840 2-0044: 0x0000 is not a valid video input!
    [ 135.328566] cx25840 2-0044: 0x0000 is not a valid video input!


    I can login so hopefully I can back out or repair what happened at the command line?

    HELP!!

    P.S. "free -m" now reports 3764MB total, so pretty sure pae IS working!
    Last edited by noleks; March 31st, 2011 at 03:57 PM. Reason: More info

  4. #4
    Join Date
    Jun 2007
    Beans
    11,026

    Re: Memory Upgrade- Memory Not Being Used?

    It looks like your video tuner card is not liking the PAE kernel. Just boot into the old kernel.

  5. #5
    Join Date
    Mar 2010
    Beans
    19
    Distro
    Ubuntu 9.10 Karmic Koala

    Re: Memory Upgrade- Memory Not Being Used?

    Hi:
    Looking at the undo procedure in the "Enabling PAE" howto I noticed I was missing one package:

    linux-headers-generic-pae 2.6.32.30.36

    This seems to have fixed things.

    Thanks!!

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