Why my usage memory less than total ram

Hai, I just installed manjaro KDE, but it only gives me 6.71 Gib of my 8 rams, where other 2 GiB that not being used? Is there any way to use all my ram and fix what caused this? and here some of my system list and my bios list

[reinhartj@reinhart-pc ~]$ inxi -F
System:    Host: reinhart-pc Kernel: 4.19.29-1-MANJARO x86_64 bits: 64 Desktop: KDE Plasma 5.15.3 Distro: Manjaro Linux 
Machine:   Type: Laptop System: Acer product: Aspire A315-41 v: V1.11 serial: <root required> 
           Mobo: RR model: Metapod_RR v: V1.11 serial: <root required> UEFI: Insyde v: 1.11 date: 10/30/2018 
Battery:   ID-1: BAT1 charge: 12.5 Wh condition: 32.7/36.7 Wh (89%) 
CPU:       Topology: Quad Core model: AMD Ryzen 5 2500U with Radeon Vega Mobile Gfx bits: 64 type: MT MCP L2 cache: 2048 KiB 
           Speed: 1408 MHz min/max: 1600/2000 MHz Core speeds (MHz): 1: 1777 2: 1369 3: 2130 4: 2071 5: 1507 6: 1595 7: 1387 
           8: 1506 
Graphics:  Device-1: AMD Raven Ridge [Radeon Vega Series / Radeon Vega Mobile Series] driver: amdgpu v: kernel 
           Display: x11 server: X.Org 1.20.4 driver: amdgpu FAILED: ati unloaded: modesetting resolution: 1366x768~60Hz 
           OpenGL: renderer: AMD RAVEN (DRM 3.27.0 4.19.29-1-MANJARO LLVM 7.0.1) v: 4.5 Mesa 18.3.4 
Audio:     Device-1: Advanced Micro Devices [AMD/ATI] Raven/Raven2/Fenghuang HDMI/DP Audio driver: snd_hda_intel 
           Device-2: Advanced Micro Devices [AMD] Family 17h HD Audio driver: snd_hda_intel 
           Sound Server: ALSA v: k4.19.29-1-MANJARO 
Network:   Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet driver: r8168 
           IF: enp1s0f1 state: up speed: 1000 Mbps duplex: full mac: 98:28:a6:0a:b6:4d 
           Device-2: Qualcomm Atheros QCA9377 802.11ac Wireless Network Adapter driver: ath10k_pci 
           IF: wlp2s0 state: down mac: 16:38:dd:18:cd:92 
           IF-ID-1: tun0 state: unknown speed: 10 Mbps duplex: full mac: N/A 
Drives:    Local Storage: total: 931.51 GiB used: 8.51 GiB (0.9%) 
           ID-1: /dev/sda vendor: Western Digital model: WD10SPZX-21Z10T0 size: 931.51 GiB 
Partition: ID-1: / size: 474.14 GiB used: 8.51 GiB (1.8%) fs: ext4 dev: /dev/sda2 
           ID-2: swap-1 size: 5.86 GiB used: 0 KiB (0.0%) fs: swap dev: /dev/sda5 
Sensors:   System Temperatures: cpu: 51.4 C mobo: N/A gpu: amdgpu temp: 51 C 
           Fan Speeds (RPM): N/A 
Info:      Processes: 231 Uptime: 41m Memory: 6.71 GiB used: 2.13 GiB (31.7%) Shell: bash inxi: 3.0.32 

And please don't count this as spam. I need some actual help/tips.

See this older discussion

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since it is ryzen your ram might be used as a graphics card vram.
at least this is true for desktop.
and one more thing.
the ram is measured in.mebibytes and gibibytes not mega/giga bytes


Where did you learn math? :smile:


Hej man;

it is becouse in linux is not show the same numer what you have installed Why ?? becouse if you use the command free -h you will see how the memory ram is distribuited

Linux is taking advantage of the free memory of the system to load the disk caches, so the read / write operations have better performance, and in general, the performance of the system improves, and much.

When we have few applications, or little memory consumed, Linux still uses it for disk cache, so we see that the memory consumption increases, without diminishing the performance of the system.

If we open more applications, or current applications require more memory consumption, simply the memory manager of the kernel will release part of the memory used for cache, and assign it to the applications that require it.

You should sum used +free +shared +buff/cache to see the real RAM you have.

I hope it help you

[reinhartj@reinhart-pc ~]$ free -h
              total        used        free      shared  buff/cache   available
Mem:          6,7Gi       1,1Gi       4,9Gi        63Mi       709Mi       5,3Gi
Swap:         5,9Gi          0B       5,9Gi

63MiB + 709MiB + 5,3GiB = 6,05GiB = 6,5GiB
stil way less from my total memory

should I give the dmidecode list?

Here's the options:

  • Your computer seller lied to you.
  • You don't understand binary.

There are a million articles out there on how to decipher RAM. Read one of them and quit wasting users time.


Fine, my total memory is (8192 MB = 7812.5 MiB = 7.63 GiB), my usage memory is 6.71 GiB (from inxi -F). Sill it not telling me why 0.92 Gib ( 7.63 GiB - 6.71 GiB = 0.92 GiB) is not usage

In reality you should only see 640K so the penguin could not eat it all.


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