Weird Memory Issue

[Riodda]

Hi all. I have freenas installed on Proliant Micro Gen 8. Today i made a memory upgrade from 12Gb to 16gb. Ilo sees all the 16gb, from dmidecode -t memory i see all the 2 banks, but from the dashboard i see only 8 gb of memory installed.
System is working well and running stable but i'm just worried the OS is not using all the memory.
Any idea ? Thanks.

Code:

# dmidecode 3.2
Scanning /dev/mem for entry point.
SMBIOS 2.7 present.

Handle 0x1000, DMI type 16, 23 bytes
Physical Memory Array
    Location: System Board Or Motherboard
    Use: System Memory
    Error Correction Type: Single-bit ECC
    Maximum Capacity: 16 GB
    Error Information Handle: Not Provided
    Number Of Devices: 2

Handle 0x1100, DMI type 17, 40 bytes
Memory Device
    Array Handle: 0x1000
    Error Information Handle: Not Provided
    Total Width: 72 bits
    Data Width: 64 bits
    Size: 8192 MB
    Form Factor: DIMM
    Set: None
    Locator: PROC  1 DIMM  1
    Bank Locator: Not Specified
    Type: DDR3
    Type Detail: Synchronous Registered (Buffered)
    Speed: 1600 MT/s
    Manufacturer: UNKNOWN
    Serial Number: Not Specified
    Asset Tag: Not Specified
    Part Number: NOT AVAILABLE       
    Rank: 2
    Configured Memory Speed: 1600 MT/s
    Minimum Voltage: 1.5 V
    Maximum Voltage: 1.5 V
    Configured Voltage: 1.5 V

Handle 0x1101, DMI type 17, 40 bytes
Memory Device
    Array Handle: 0x1000
    Error Information Handle: Not Provided
    Total Width: 72 bits
    Data Width: 64 bits
    Size: 8192 MB
    Form Factor: DIMM
    Set: 1
    Locator: PROC  1 DIMM  2
    Bank Locator: Not Specified
    Type: DDR3
    Type Detail: Synchronous Unbuffered (Unregistered)
    Speed: 1600 MT/s
    Manufacturer: UNKNOWN
    Serial Number: Not Specified
    Asset Tag: Not Specified
    Part Number: NOT AVAILABLE       
    Rank: 2
    Configured Memory Speed: 1600 MT/s
    Minimum Voltage: 1.5 V
    Maximum Voltage: 1.5 V
    Configured Voltage: 1.5 V

 

[Riodda]

I had another look to the dmesg and seems that half of the memory is not made avilable to the OS that it's quite strange....

Code:

real memory  = 17179869184 (16384 MB)
avail memory = 8231018496 (7849 MB)

Code:

SYSTEM MEMORY INFORMATION:
mem_wire:        2284638208 (   2178MB) [ 27%] Wired: disabled for paging out
mem_active:  +    589119488 (    561MB) [  7%] Active: recently referenced
mem_inactive:+   2682347520 (   2558MB) [ 32%] Inactive: recently not referenced
mem_cache:   +            0 (      0MB) [  0%] Cached: almost avail. for allocation
mem_free:    +   2732408832 (   2605MB) [ 32%] Free: fully available for allocation
mem_gap_vm:  +      -229376 (      0MB) [  0%] Memory gap: UNKNOWN
______________ ____________ ___________ ______
mem_all:     =   8288284672 (   7904MB) [100%] Total real memory managed
mem_gap_sys: +    219242496 (    209MB)        Memory gap: Kernel?!
______________ ____________ ___________
mem_phys:    =   8507527168 (   8113MB)        Total real memory available
mem_gap_hw:  +     82407424 (     78MB)        Memory gap: Segment Mappings?!
______________ ____________ ___________
mem_hw:      =   8589934592 (   8192MB)        Total real memory installed

SYSTEM MEMORY SUMMARY:
mem_used:        3175178240 (   3028MB) [ 36%] Logically used memory
mem_avail:   +   5414756352 (   5163MB) [ 63%] Logically available memory
______________ ____________ __________ _______
mem_total:   =   8589934592 (   8192MB) [100%] Logically total memory

 

[Niel Archer]

I'm seeing the same issue. I have just upgraded to 64GB (from 16GB), both configurations only show half of the actual memory.

logging in via ssh and using top reports the correct amount of RAM.

 

[macmuchmore]

I am having a similar issue:

I have a Ryzen 5 3400g system on a Gigabyte x570 Aorus Elite motherboard. I had 4 sticks of 8GB RAM installed for a total of 32GB - and FreeNAS showed all 32GBs. I changed to 2 sticks of 16GB RAM. Bios shows all the RAM, but FreeNAS only shows half. In the Shell I typed:
# dmesg | grep memory

The result was:
real memory = 34359738368 (32768 MB)
avail memory = 16247934976 (15495 MB)

I reset the Bios to make sure the RAM is seen correctly in the Bios (it is). Do I need to reinstall FreeNAS or is there something else I need to do to fix this? Thanks in advance for any help!