Weblog entry #12 for sebastian

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#12
Why is 2 GB of RAM not default supported :(
Posted by sebastian on Mon 27 Mar 2006 at 13:03
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Why is 2 GB of RAM nog default supported in the default 2.6 kernel of Debian Sarge. Now i've installed a server with 2.6 in stead of the 2.4 kernel we use by default and STILL I don't get more memory then 1 GB.

Does somebody know why?
Thnx! Sebastian Broekhoven
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#1
Re: Why is 2 GB of RAM nog default supported :(
Posted by JulienV (86.204.xx.xx) on Mon 27 Mar 2006 at 16:03
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You have to activate HIGHMEM support in the kernel configuration, which is on by default on Debian SMP kernels.

Cheers,
Julien

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#2
Re: Why is 2 GB of RAM nog default supported :(
Posted by sebastian (82.134.xx.xx) on Mon 27 Mar 2006 at 19:35
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Thank you! I installed a 2.4 686-smp kernel and that one works. Now a little other thing, it only support to 3 GB. And there is 4 GB in the server.

Cheers, Sebastian

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#3
Re: Why is 2 GB of RAM nog default supported :(
Posted by JulienV (81.50.xx.xx) on Mon 27 Mar 2006 at 19:44
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Are you sure you should have installed an SMP kernel? What is your CPU?

I think you'd better recompile your kernel...

There are different levels for HIGHMEM (up to 4GB and up to 6GB) - thus I don't understand why you only see 3GB.

HIGHMEM has changed with the latest 2.6.16 kernel, and allows much nicer options, maybe this can be of interest for you

Cheers,
Julien

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#4
Re: Why is 2 GB of RAM nog default supported :(
Posted by sebastian (82.134.xx.xx) on Mon 27 Mar 2006 at 19:48
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Hmmmz.... i shall try the 2.6 kernel.

Cheers, Sebastian

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#5
Re: Why is 2 GB of RAM nog default supported :(
Posted by JulienV (81.50.xx.xx) on Mon 27 Mar 2006 at 19:51
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Oh yes, I hadn't paid attention to the fact you had installed a 2.4 kernel. I don't remember what are HIGHMEM choices with 2.4.

Cheers,
Julien

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#6
Re: Why is 2 GB of RAM nog default supported :(
Posted by Anonymous (83.95.xx.xx) on Mon 3 Apr 2006 at 11:38
Probably because you use the 32-bit kernel. In 32-bit mode the bios snatches a part of the last 4GB range for device addresses. The chunk it takes can differ from system to system.

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#7
Re: Why is 2 GB of RAM not default supported :(
Posted by Anonymous (125.235.xx.xx) on Fri 14 Apr 2006 at 05:11
I have a 2 processor with 4 GB RAM server.

I installed Debian Sarge and it use 2.6.8-2 non-smp kernel by default, so it recognize 885M RAM.

I upgraded to 2.6.8-2 smp kernel, but it still recognize 3163M (3GB) RAM.

Can anyone help me to use full 4GB RAM??

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#8
Re: Why is 2 GB of RAM not default supported :(
Posted by Anonymous (207.145.xx.xx) on Wed 21 Jun 2006 at 13:57
Sure, use Red Hat or Cent OS. They both support up to 16 GB of RAM in their 32 bit releases.

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