Two Linux Servers with Same Hardware Specifications Shows Different Memory Values on '/proc/meminfo'

(Doc ID 2336612.1)

Last updated on DECEMBER 12, 2017

Applies to:

Linux OS - Version Oracle Linux 7.2 with Unbreakable Enterprise Kerne [3.8.13] and later
Linux x86-64
Linux x86

Symptoms

The two servers that have exactly same hardware model and specifications, but show different MemTotal values from the /proc/meminfo file.

For Example:

Product Name: PRIMERGY RX2540 M2
Product Name: D3289-B1
Vendor: FUJITSU // American Megatrends Inc.

Same hardware information from dmidecode result:

# grep Strings ***db02
OEM Strings
String 1: FUJITSU
String 2: FUJITSU
String 3: FUJITSU TECHNOLOGY SOLUTIONS

# grep Strings ***db03
OEM Strings
String 1: FUJITSU
String 2: FUJITSU
String 3: FUJITSU TECHNOLOGY SOLUTIONS

# diff ***db02/dmidecode ***db03/dmidecode
424c424
< Serial Number: 19791722
---
> Serial Number: 19791EFE
505c505
< Serial Number: 1957727E
---
> Serial Number: 19791EB2
586c586
< Serial Number: 197915C7
---
> Serial Number: 1957627D
667c667
< Serial Number: 188E7A75
---
> Serial Number: 188E7A22
1034c1034
< BF 11 EE 89 D1 79 D9 44 A8 A3 B2 97 62 9E 8F EF
---
> FE D3 7F 0C 5B D6 4D 4D A8 69 73 03 ED 62 77 4D
1059,1060c1059,1060
< Serial Number: MA6C208969
< UUID: 893C0DEB-B337-4EC9-AA8F-3652CE0260F3
---
> Serial Number: MA6C208893
> UUID: 16B8A618-DD3C-554A-BD52-0C7FA888EBF3
1070c1070
< Serial Number: 53778615
---
> Serial Number: 53774532
1086c1086
< Serial Number: MA6C208969
---
> Serial Number: MA6C208893

***db02/proc/meminfo

MemTotal: 65390980 kB                                                               <<<
MemFree: 5723552 kB
Buffers: 260008 kB
Cached: 27766576 kB
SwapCached: 0 kB
Active: 2709708 kB
Inactive: 26742964 kB
Active(anon): 1036568 kB
Inactive(anon): 524956 kB
Active(file): 1673140 kB
Inactive(file): 26218008 kB
Unevictable: 232572 kB
Mlocked: 232580 kB
SwapTotal: 33554428 kB
SwapFree: 33554428 kB
Dirty: 1220952 kB
Writeback: 0 kB
AnonPages: 1666708 kB
Mapped: 640136 kB
Shmem: 62252 kB
Slab: 1021452 kB
SReclaimable: 867832 kB
SUnreclaim: 153620 kB
KernelStack: 9472 kB
PageTables: 77116 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 52083900 kB
Committed_AS: 5351804 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 407704 kB
VmallocChunk: 34359253944 kB
HardwareCorrupted: 0 kB
HugePages_Total: 13834
HugePages_Free: 11786
HugePages_Rsvd: 11712
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 9156 kB <<<
DirectMap2M: 1761280 kB
DirectMap1G: 67108864 kB

 

***db03/proc/meminfo:

MemTotal: 65391036 kB                                                                       <<<
MemFree: 29230084 kB
Buffers: 259860 kB
Cached: 4879336 kB
SwapCached: 0 kB
Active: 2997008 kB
Inactive: 3599048 kB
Active(anon): 2030848 kB
Inactive(anon): 339824 kB
Active(file): 966160 kB
Inactive(file): 3259224 kB
Unevictable: 227880 kB
Mlocked: 227896 kB
SwapTotal: 33554428 kB
SwapFree: 33554428 kB
Dirty: 945180 kB
Writeback: 0 kB
AnonPages: 1693956 kB
Mapped: 629356 kB
Shmem: 840484 kB
Slab: 356896 kB
SReclaimable: 200836 kB
SUnreclaim: 156060 kB
KernelStack: 9168 kB
PageTables: 98704 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 52083928 kB
Committed_AS: 6332456 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 407684 kB
VmallocChunk: 34359259144 kB
HardwareCorrupted: 0 kB
HugePages_Total: 13834
HugePages_Free: 11778
HugePages_Rsvd: 11704
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 9212 kB <<<
DirectMap2M: 1761280 kB
DirectMap1G: 67108864 kB

Cause

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