Dell PowerEdge 6850 doesn't see all 32 Gb of RAM

[Stephen John Smoogen]

On Wed, Jul 9, 2008 at 6:28 PM,  <Ronnie_Jackson at dell.com> wrote:
> I have a Dell PowerEdge 6850 that has 32 Gb of RAM. However, we can only see
> about 28 Gb of the RAM. The Linux version  is 2.6.18-92.1.1.el5
> (brewbuilder at hs20-bc2-4.build.redhat.com) (gcc version 4.1.2 20071124 (Red
> Hat 4.1.2-41)) #1 SMP
>

I hope this is useful, and if I am incorrect.. please let me know. I
have not had to deal with a big memory system (2950's don't go that
far :))  in 3 years so my info could be flat out wrong.

Is this 32 bit or 64 bit?

With over 4 GB of ram on a 32bit, you are playing with all kinds of
tricks to see higher amounts of ram.  For some systems, I know that
some of the ram can not be seen because of the x86 reserving space for
various 'bounce buffers' to move memory from the high to what a 32 bit
architecture can really see. The PCI can also 'reserve' space on the
system that might make some RAM un-mappable.

Some systems need to get BIOS updates.. others you just have to tell
the client they need to use 64 bit.

I hope this is useful, and if I am incorrect.. please let me know. I
have not had to deal with a big memory system in 3 years so my info

> Does anyone have any idea what the problem is?
>
> Ronnie Jackson | Dell Inc.
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-- 
Stephen J Smoogen. -- BSD/GNU/Linux
How far that little candle throws his beams! So shines a good deed
in a naughty world. = Shakespeare. "The Merchant of Venice"