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



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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