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Thread: A Question on the RAM Usage of Ubuntu 12.04.02 32bit Desktop

  1. #1
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    Talking A Question on the RAM Usage of Ubuntu 12.04.02 32bit Desktop

    Based on my "old" experience, 32bit OS should be only support RAM less than 3.5~4GB, but why ubuntu 32bit supports RAM over 4GB. I didn't install any 3rd party software, or anything to do with PAE tools.

    Environment:
    1. VMWare Workstation 9
    2. Ubuntu 12.04.02 32bit Desktop Version


    Please refer to the image below:
    ubuntu 12.04.02 ram usage.jpg

    It would be appreciated for any comments on this.

    Thanks,
    Hang

  2. #2
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    Re: A Question on the RAM Usage of Ubuntu 12.04.02 32bit Desktop

    what kernel are you using?

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    Re: A Question on the RAM Usage of Ubuntu 12.04.02 32bit Desktop

    I'st called a PAE kernel.
    Splat Double Splat Triple Splat
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    Re: A Question on the RAM Usage of Ubuntu 12.04.02 32bit Desktop

    Ubuntu 12.04 comes by default with PAE.
    About problems due to upgrading
    Bringing old hardware back to life.
    Please visit Quick Links -> Unanswered Posts

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    Re: A Question on the RAM Usage of Ubuntu 12.04.02 32bit Desktop

    Quote Originally Posted by hangpan View Post
    Based on my "old" experience, 32bit OS should be only support RAM less than 3.5~4GB, but why ubuntu 32bit supports RAM over 4GB. I didn't install any 3rd party software, or anything to do with PAE tools.

    Correct: in the old days, 32-bit kernel meant no more than 3.5GB RAM usage.
    However, current Ubuntu versions install the PAE kernel by default, and thus will access all the RAM you have got.


    So ... boom ... there goes an advantage of 64-bit.
    The only advantage of 64-bit I now know, is: no rollover of the TX/RX byte counter in ifconfig ...

    HTH

  6. #6
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    Re: A Question on the RAM Usage of Ubuntu 12.04.02 32bit Desktop

    Quote Originally Posted by sanderj View Post
    So ... boom ... there goes an advantage of 64-bit.
    The only advantage of 64-bit I now know, is: no rollover of the TX/RX byte counter in ifconfig ...
    Not really. A 64-bit kernel supports large amounts of RAM natively, without having to run hacky PAE in userspace.

    The main advantage of 64-bit remains the same; it's significantly faster for any kind of serious number crunching (eg: video or audio re-encoding, encryption, compression, etc). PAE is cool, but it's really just a bridging solution while we complete the switch to the new standard of 64-bit.

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    Re: A Question on the RAM Usage of Ubuntu 12.04.02 32bit Desktop

    Although a PAE kernel can address more than 4GB of RAM, it doesn't do it very well.
    You may want to read what Linus thinks of the PAE kernel...

    Linus on PAE
    Cheesemill

  8. #8
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    Re: A Question on the RAM Usage of Ubuntu 12.04.02 32bit Desktop

    Many thanks guys, learn a lot. The kernel version I used is: Ubuntu 12.04.02 LTS

    You guys are right, the 32bit 12.04.02 ubuntu came up with pae-enabled, I found it here as well: http://ubuntuforums.org/showthread.php?t=1919647
    I know little about PAE, now it's time to pick it up.

    Thanks everyone again.

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    Re: A Question on the RAM Usage of Ubuntu 12.04.02 32bit Desktop

    Quote Originally Posted by hangpan View Post
    Many thanks guys, learn a lot. The kernel version I used is: Ubuntu 12.04.02 LTS

    You guys are right, the 32bit 12.04.02 ubuntu came up with pae-enabled, I found it here as well: http://ubuntuforums.org/showthread.php?t=1919647
    I know little about PAE, now it's time to pick it up.

    Thanks everyone again.
    Why not use 64-bit?

  10. #10
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    Re: A Question on the RAM Usage of Ubuntu 12.04.02 32bit Desktop

    Quote Originally Posted by sanderj View Post
    Why not use 64-bit?
    +1 to this. If its not too much inconvenience, start again with the proper architecture rather than add on a workaround.

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