OS does not see all my RAM

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On Mon, 2005-10-03 at 10:33 -0400, Robin Mordasiewicz wrote:
> My BIOS shows all my RAM, but when I boot up linux it does not see all the 
> RAM
> 
> I have two one GIG sticks of RAM, which show up in my bios, but when 
> typing free, I see that it only shows 256Megs.
> 
> Is there a way to specify the amount of RAM if linux cannot detect this, 
> or how can I fix/tweak the OS to recognize the amount of RAM
> 
> my OS is centos-4-x86_64 on a DELL 1850
> 
> [root@smtcorav02 ~ ]# free
>               total       used       free     shared    buffers     cached
> Mem:        251360     220136      31224          0       3932      64748
> -/+ buffers/cache:     151456      99904
> Swap:       524280          0     524280
> 
> 
Some video cards swipe some ram, maybe this is what you are seeing. I
have also seen hardware based agents swipe ram as well.


Regards,
Ted


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