Stephen John Smoogen wrote:
> On Tue, Dec 30, 2008 at 10:52 PM, Chris Adams
> <[email protected]> wrote:
>   
>> I am running RedHat 5 on a 32 bit system with 2 GB RAM . I have verified
>> that the hardware supports at least 4 GB RAM. I added an additional 2 GB
>> ram. However, issuing the various command to show memory available, it would
>> only show ~2.5 GB.
>>
>> So, reading about the PAE kernel, I installed it via RPM and after
>> rebooting, verified that the /etc/grub.conf file shows the PAE kernel first
>> and the Default=0. When I run 'cat /proc/meminfo' and 'free -om', it still
>> reports 2.5 GB.
>>
>> Can someone explain what is going on and what I should do, other than
>> upgrading to a 64 bit system? I have done this same update on an identical
>> server running CentOS 5 and it recognizes the 4 GB.
>>     
>
> Well the first thing is to make sure the servers are identical... make
> sure the BIOS version and BIOS settings are exactly the same. I had a
> set of boxes where the BIOS's were identical but for some reason the
> shipped settings were different and RAM would not show up. After that,
> what does uname -a show.
>
>
>   
I would also try adding the mem=4000M parameter to the kernel boot params.

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