Re: 64 Bit Linux shows 4GB... was Using all of 4GB RAM...

["Adam Hough" <adam gradientzero com>]

On Thu, Oct 2, 2008 at 2:37 AM, Theodore Papadopoulo
<Theodore Papadopoulo sophia inria fr> wrote:
> Linuxguy123 wrote:
>>
>> Dennis Gilmore suggested that I boot a 64 bit Live CD to see what it
>> said about memory usage.  So I did:
>>
>> [fedora localhost ~]$ free -m
>>             total       used       free     shared    buffers
>> cached
>> Mem:          3969       1286       2682          0        143
>> 827
>> -/+ buffers/cache:        315       3654
>> Swap:         1992          0       1992
>>
>> Here is what it looks like under my 32 bit installation:
>>
>> $ free -m
>>             total       used       free     shared    buffers
>> cached
>> Mem:          3034        978       2055          0         33
>> 619
>> -/+ buffers/cache:        326       2708
>> Swap:         1992          0       1992
>>
>> I appear to gain 935MB of RAM running the 64 bit version.  This is in
>> spite of the spec sheet on my laptop saying:
>>
>
> Could it be simply that free does not show the space needed by the
> kernel.... which needs (at least some parts of it)
> to be constantly in memory. I do not think that 127Mb is such a big price to
> pay for the kernel. Note that to use your
> memory in a single process you need x86-64. The standard x86 linux limits
> the processes memory to 2Gb.
>
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If you run the PAE kernel, then all of your memory will be seen and
used by the OS.  It is what I use when I use a desktop system so that
I do not have to deal with x86_64 type desktop issues.