Question

1

Not showing available RAM

rated 0 times [ 1] [ 0] / answers: 1 / hits: 761 / 1 Year ago, tue, november 29, 2022, 12:04:50

I am currently running Ubuntu on my Laptop. According to my specs and looking at my bios there should be 16GiB of RAM. When I first got it there were 16GiB of RAM, but whenever I call free or htop right now, it only shows 12GiB. The output for free is:

              total        used        free      shared  buff/cache   available

Mem:       12077124     1817484     8333912       18500     1925728     9965952

Swap:      33554428           0    33554428

and the output for dmesg | grep -i memory is:

[    0.004350] check: Scanning 1 areas for low memory corruption

[    0.004667] ACPI: Reserving FACP table memory at [mem 0xc5993000-0xc5993113]

[    0.004668] ACPI: Reserving DSDT table memory at [mem 0xc597c000-0xc598d8ca]

[    0.004669] ACPI: Reserving FACS table memory at [mem 0xcbc19000-0xcbc1903f]

[    0.004669] ACPI: Reserving SSDT table memory at [mem 0xc7c9c000-0xc7c9c0a1]

[    0.004670] ACPI: Reserving SSDT table memory at [mem 0xc7c9a000-0xc7c9b18e]

[    0.004670] ACPI: Reserving SSDT table memory at [mem 0xc7c8c000-0xc7c93228]

[    0.004671] ACPI: Reserving IVRS table memory at [mem 0xc7c6a000-0xc7c6a1a3]

[    0.004671] ACPI: Reserving SSDT table memory at [mem 0xc7c38000-0xc7c38a41]

[    0.004672] ACPI: Reserving SSDT table memory at [mem 0xc7bb3000-0xc7bb3631]

[    0.004672] ACPI: Reserving TPM2 table memory at [mem 0xc7bb2000-0xc7bb2033]

[    0.004673] ACPI: Reserving POAT table memory at [mem 0xc7baf000-0xc7baf054]

[    0.004673] ACPI: Reserving BATB table memory at [mem 0xc7b9a000-0xc7b9a049]

[    0.004674] ACPI: Reserving HPET table memory at [mem 0xc5992000-0xc5992037]

[    0.004675] ACPI: Reserving APIC table memory at [mem 0xc5991000-0xc5991137]

[    0.004675] ACPI: Reserving MCFG table memory at [mem 0xc5990000-0xc599003b]

[    0.004676] ACPI: Reserving SBST table memory at [mem 0xc598f000-0xc598f02f]

[    0.004676] ACPI: Reserving WSMT table memory at [mem 0xc598e000-0xc598e027]

[    0.004677] ACPI: Reserving VFCT table memory at [mem 0xc596e000-0xc597b883]

[    0.004677] ACPI: Reserving SSDT table memory at [mem 0xc5968000-0xc596d353]

[    0.004678] ACPI: Reserving CRAT table memory at [mem 0xc5967000-0xc5967ebf]

[    0.004679] ACPI: Reserving CDIT table memory at [mem 0xc5966000-0xc5966028]

[    0.004679] ACPI: Reserving FPDT table memory at [mem 0xc7b9b000-0xc7b9b033]

[    0.004680] ACPI: Reserving SSDT table memory at [mem 0xc5965000-0xc5965148]

[    0.004680] ACPI: Reserving SSDT table memory at [mem 0xc5963000-0xc59644ba]

[    0.004681] ACPI: Reserving SSDT table memory at [mem 0xc5961000-0xc596257f]

[    0.004681] ACPI: Reserving SSDT table memory at [mem 0xc595d000-0xc5960972]

[    0.004682] ACPI: Reserving BGRT table memory at [mem 0xc595c000-0xc595c037]

[    0.004683] ACPI: Reserving SSDT table memory at [mem 0xc595b000-0xc595b057]

[    0.004683] ACPI: Reserving SSDT table memory at [mem 0xc595a000-0xc595a24c]

[    0.004684] ACPI: Reserving SSDT table memory at [mem 0xc5958000-0xc59592bb]

[    0.004684] ACPI: Reserving SSDT table memory at [mem 0xc5957000-0xc5957ad4]

[    0.004685] ACPI: Reserving UEFI table memory at [mem 0xcbc18000-0xcbc180d9]

[    0.004685] ACPI: Reserving SSDT table memory at [mem 0xc5956000-0xc5956051]

[    0.004686] ACPI: Reserving SSDT table memory at [mem 0xc7c98000-0xc7c9808f]

[    0.004687] ACPI: Reserving SSDT table memory at [mem 0xc7c97000-0xc7c979b4]

[    0.004947] Early memory node ranges

[    0.032537] PM: hibernation: Registered nosave memory: [mem 0x00000000-0x00000fff]

[    0.032539] PM: hibernation: Registered nosave memory: [mem 0x0009f000-0x0009ffff]

[    0.032539] PM: hibernation: Registered nosave memory: [mem 0x000a0000-0x000dffff]

[    0.032540] PM: hibernation: Registered nosave memory: [mem 0x000e0000-0x000fffff]

[    0.032541] PM: hibernation: Registered nosave memory: [mem 0x09c00000-0x09da0fff]

[    0.032542] PM: hibernation: Registered nosave memory: [mem 0x09f00000-0x09f0cfff]

[    0.032542] PM: hibernation: Registered nosave memory: [mem 0x9973c000-0x9973cfff]

[    0.032543] PM: hibernation: Registered nosave memory: [mem 0x99749000-0x99749fff]

[    0.032544] PM: hibernation: Registered nosave memory: [mem 0xc0a5b000-0xc0aebfff]

[    0.032545] PM: hibernation: Registered nosave memory: [mem 0xc1214000-0xc1214fff]

[    0.032546] PM: hibernation: Registered nosave memory: [mem 0xc1bee000-0xc1beefff]

[    0.032547] PM: hibernation: Registered nosave memory: [mem 0xc4b7e000-0xcad7dfff]

[    0.032548] PM: hibernation: Registered nosave memory: [mem 0xcad7e000-0xcbd7dfff]

[    0.032548] PM: hibernation: Registered nosave memory: [mem 0xcbd7e000-0xcbdfdfff]

[    0.032549] PM: hibernation: Registered nosave memory: [mem 0xce000000-0xcfffffff]

[    0.032549] PM: hibernation: Registered nosave memory: [mem 0xd0000000-0xf7ffffff]

[    0.032550] PM: hibernation: Registered nosave memory: [mem 0xf8000000-0xfbffffff]

[    0.032550] PM: hibernation: Registered nosave memory: [mem 0xfc000000-0xfdbfffff]

[    0.032551] PM: hibernation: Registered nosave memory: [mem 0xfdc00000-0xfdcfffff]

[    0.032551] PM: hibernation: Registered nosave memory: [mem 0xfdd00000-0xfed7ffff]

[    0.032551] PM: hibernation: Registered nosave memory: [mem 0xfed80000-0xfed80fff]

[    0.032552] PM: hibernation: Registered nosave memory: [mem 0xfed81000-0xffffffff]

[    0.071132] Memory: 11923324K/12401088K available (14345K kernel code, 3478K rwdata, 10340K rodata, 2688K init, 5976K bss, 477504K reserved, 0K cma-reserved)

[    0.109279] Freeing SMP alternatives memory: 40K

[    0.255382] x86/mm: Memory block size: 128MB

[    0.633239] Freeing initrd memory: 56768K

[    0.636859] check: Scanning for low memory corruption every 60 seconds

[    0.922923] Freeing unused decrypted memory: 2036K

[    0.923550] Freeing unused kernel image (initmem) memory: 2688K

[    0.936446] Freeing unused kernel image (text/rodata gap) memory: 2036K

[    0.937019] Freeing unused kernel image (rodata/data gap) memory: 1948K

[    2.777602] Non-volatile memory driver v1.3

[    3.074212] amdgpu 0000:07:00.0: amdgpu: Trusted Memory Zone (TMZ) feature disabled as experimental (default)

[    3.314687] [TTM] Zone  kernel: Available graphics memory: 6038562 KiB

[    3.314688] [TTM] Zone   dma32: Available graphics memory: 2097152 KiB

[    3.314780] [drm] amdgpu: 4096M of VRAM memory ready

[    3.314782] [drm] amdgpu: 4096M of GTT memory ready.

I do not really know what I am looking for and would love any advice. Especially the fact that it showed it and I was able to use it confuses me. What could I have done wrong?

Update 1: I ran sudo dmidecode -t memory, which gives the output:

# dmidecode 3.2

Getting SMBIOS data from sysfs.

SMBIOS 3.3.0 present.

# SMBIOS implementations newer than version 3.2.0 are not

# fully supported by this version of dmidecode.



Handle 0x0001, DMI type 16, 23 bytes

Physical Memory Array

    Location: System Board Or Motherboard

    Use: System Memory

    Error Correction Type: None

    Maximum Capacity: 64 GB

    Error Information Handle: 0x0000

    Number Of Devices: 2



Handle 0x0008, DMI type 17, 92 bytes

Memory Device

    Array Handle: 0x0001

    Error Information Handle: 0x0007

    Total Width: 64 bits

    Data Width: 64 bits

    Size: 16384 MB

    Form Factor: SODIMM

    Set: None

    Locator: DIMM 0

    Bank Locator: P0 CHANNEL A

    Type: DDR4

    Type Detail: Synchronous Unbuffered (Unregistered)

    Speed: 3200 MT/s

    Manufacturer: Hynix

    Serial Number: 00000000

    Asset Tag: Not Specified

    Part Number: HMAB2GS6AMR6N-XN    

    Rank: 1

    Configured Memory Speed: 3200 MT/s

    Minimum Voltage: 1.2 V

    Maximum Voltage: 1.2 V

    Configured Voltage: 1.2 V

    Memory Technology: DRAM

    Memory Operating Mode Capability: Volatile memory

    Firmware Version: Unknown

    Module Manufacturer ID: Bank 1, Hex 0xAD

    Module Product ID: Unknown

    Memory Subsystem Controller Manufacturer ID: Unknown

    Memory Subsystem Controller Product ID: Unknown

    Non-Volatile Size: None

    Volatile Size: 16 GB

    Cache Size: None

    Logical Size: None



Handle 0x000B, DMI type 17, 92 bytes

Memory Device

    Array Handle: 0x0001

    Error Information Handle: 0x000A

    Total Width: Unknown

    Data Width: Unknown

    Size: No Module Installed

    Form Factor: Unknown

    Set: None

    Locator: DIMM 0

    Bank Locator: P0 CHANNEL B

    Type: Unknown

    Type Detail: Unknown

    Speed: Unknown

    Manufacturer: Null

    Serial Number: Null

    Asset Tag: Not Specified

    Part Number: Null

    Rank: Unknown

    Configured Memory Speed: Unknown

    Minimum Voltage: Unknown

    Maximum Voltage: Unknown

    Configured Voltage: Unknown

    Memory Technology: Unknown

    Memory Operating Mode Capability: Unknown

    Firmware Version: Unknown

    Module Manufacturer ID: Unknown

    Module Product ID: Unknown

    Memory Subsystem Controller Manufacturer ID: Unknown

    Memory Subsystem Controller Product ID: Unknown

    Non-Volatile Size: None

    Volatile Size: None

    Cache Size: None

    Logical Size: None

Update 2: My specs are:

CPU: AMD Ryzen™ 7 PRO (5850U)



GPU: Radeon RX Vega 8



RAM: 16 GB DDR4 3200 MHz (I don't know the company)

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reangi

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answered 1 Year ago uccase · Accepted Answer

This answer has been mainly provided by jawtheshark in the comments. I am going to summarize it here to close the issue. The problem is that Linux takes, for integrated GPU's, a part of the RAM and uses it as VRAM. The graphics part of the APU reserves 4GB of the system RAM for its use. Looking at this kernel documentation: kernel.org/doc/html/latest/gpu/amdgpu.html The parameter: vramlimit (int) --> Restrict the total amount of VRAM in MiB for testing. The default is 0 (Use full VRAM). Which means that the 'auto' option for delegating RAM to the integrated GPU, delegates a large amount of RAM to the GPU. Since I only use the machine as a workstation, I will set the 'auto' option in bios to '1 GB', the minimum.