Where did the RAM go ..

Nick Lunt nick.lunt at patech-solutions.com
Tue Jun 29 07:07:34 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
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
-/+ buffers/cache:      77885      50984
Swap:        16383         92      16291
So where did 3GB disappear to ?
Many thanks,

Hi Morten

# cat /proc/mtrr
reg00: base=0x00000000 (   0MB), size=131072MB: write-back, count=1
reg01: base=0x2000000000 (131072MB), size=1024MB: write-back, count=1
reg02: base=0xc0000000 (3072MB), size=1024MB: uncachable, count=1
reg03: base=0xbfc00000 (3068MB), size=   4MB: uncachable, count=1

131072MB = 128GB so that's showing all installed RAM.


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