How to make all of 4GB of memory available?

How to make all of 4GB of memory available?

[Gene Heskett]

Greetings;

New mobo, 4 core AMD Phenom cpu & 4 GB of dram.  I cannot find the switch in a 
make xconfig that will allow use of all of it, I am only seeing 3GB.

Am I going blind in my dotage?

Thanks.

-- 
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Re: How to make all of 4GB of memory available?

[Chris Friesen]

Gene Heskett wrote:
> Greetings;
> 
> New mobo, 4 core AMD Phenom cpu & 4 GB of dram.  I cannot find the switch in a 
> make xconfig that will allow use of all of it, I am only seeing 3GB.
> 
> Am I going blind in my dotage?

Maybe post your .config file?

Chris

Re: How to make all of 4GB of memory available?

[Kasper Sandberg]

On Wed, 2008-10-01 at 14:17 -0400, Gene Heskett wrote:
> Greetings;
> 
> New mobo, 4 core AMD Phenom cpu & 4 GB of dram.  I cannot find the switch in a 
> make xconfig that will allow use of all of it, I am only seeing 3GB.
> 
> Am I going blind in my dotage?

Are you using 32bit? if so, are you use PAE?

> 
> Thanks.
> 

Re: How to make all of 4GB of memory available?

[Jeremy Fitzhardinge]

Gene Heskett wrote:
> Greetings;
>
> New mobo, 4 core AMD Phenom cpu & 4 GB of dram.  I cannot find the switch in a 
> make xconfig that will allow use of all of it, I am only seeing 3GB.
>
> Am I going blind in my dotage?

Does it all appear in the e820 map?  If not, then the chipset is 
probably masking it; check to see if there's any likely-looking BIOS 
options to make it appear.

I assume you're compiling for either 32-bit PAE or 64-bit.  If you're 
compiling 32-bit without PAE (HIGHMEM64G) then the remaining Gbyte may 
simply be above 4G and out of the kernel's reach.

    J

Re: How to make all of 4GB of memory available?

[Robert Hancock]

Gene Heskett wrote:
> Greetings;
> 
> New mobo, 4 core AMD Phenom cpu & 4 GB of dram.  I cannot find the switch in a 
> make xconfig that will allow use of all of it, I am only seeing 3GB.
> 
> Am I going blind in my dotage?
> 
> Thanks.
> 

HIGHMEM64G. Or better yet, use a 64-bit kernel.

Re: How to make all of 4GB of memory available?

[Wakko Warner]

Robert Hancock wrote:
> Gene Heskett wrote:
> >New mobo, 4 core AMD Phenom cpu & 4 GB of dram.  I cannot find the switch 
> >in a make xconfig that will allow use of all of it, I am only seeing 3GB.
> >
> >Am I going blind in my dotage?
> >
> >Thanks.
> >
> 
> HIGHMEM64G. Or better yet, use a 64-bit kernel.

It may be a little odd, but I have a 64-bit x86 that I'm running 32-bit
kernel.  Mostly because I had some odd problems with various programs I was
using.  But was what more odd was the fact that I had a little less memory
(~100mb) with a 64-bit kernel than with a 32-bit PAE kernel.

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