Where did the RAM go ..

Morten P.D. Stevens mstevens at imt-systems.com
Tue Jun 29 06:25:35 CDT 2010

Hi Nick,

what is with:

cat /proc/mtrr

Does it show your full installed memory?

Best regards,


From: linux-poweredge-bounces at dell.com [mailto:linux-poweredge-bounces at dell.com] On Behalf Of Nick Lunt
Sent: Monday, June 28, 2010 2:09 PM
To: linux-poweredge at dell.com
Subject: Where did the RAM go ..

Hi folks
R900 running RHEL5.
This weekend we moved up to 128GB RAM. However I'm confused with the outputs given.
The server has 32 x 4096MB DIMM's, giving a total of 131072MB, which is 128GB.
omreport shows the following:
Total of Memory Array(s)
Attributes : Total Installed Capacity
Value      : 131072  MB  -- 128GB. Spot on, just what I expect
Attributes : Total Installed Capacity Available to the OS
Value      : 128868  MB  -- 125GB. So where did the rest go ?
# free -m
                   total          used            free     shared    buffers     cached
Mem:        128869     128245        623          0        659      49701
-/+ buffers/cache:      77885      50984
Swap:        16383         92      16291
So where did 3GB disappear to ?
Many thanks,

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