Not seeing all RAM

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Hello,

I'm running a FC6 dom0, with kernel version,
kernel-xen-2.6.19-1.2895.fc6 on a Dell PowerEdge 1600SC.  I just
upgraded it from 1 GB (2 x 512 MB modules) to 3 GB (2 x 1 GB + 2 x 512
MB).  The BIOS sees all of the ram, but kernel does not.  All I see when
I run free is this:

             total       used       free     shared    buffers
cached
Mem:       2454528     207876    2246652          0      11032
47380
-/+ buffers/cache:     149464    2305064
Swap:       524280          0     524280

It looks like 512 MB is missing.

Here's a bit more detail from dmesg:

Memory: 2874124k/2987900k available (2166k kernel code, 104532k
reserved, 1100k data, 184k init, 2242436k highmem)

So, what happened to the rest of the RAM?  I should add that the server
is updated with the latest firmware and BIOS.

BTW, I appear to be having problems with one of my domUs now too (after
the ram upgrade).  A PCI device I was handing to the domU is now causing
the domU kernel to panic, crashing the domU.  I'll try to get a copy of
the error message.

Any help appreciated.

Regards,

Ranbir
-- 
Kanwar Ranbir Sandhu
Linux 2.6.20-1.2944.fc6 i686 GNU/Linux 
00:17:27 up 10:25, 2 users, load average: 0.68, 0.43, 0.26 


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