Total RAM not available

[ddelmege]

running on DELL Inspiron 5559. Upgraded to 16gb of RAM. Running latest BIOS 1.19.0. BIOS and System details show 16gb. memtest86+ and running 'top' only show 6gb of RAM. nothing is set contrary in /proc/cmdline.

See the following lines in DMESG:

[ 0.071298] DMAR: [Firmware Bug]: No firmware reserved region can cover this RMRR [0x0000000079800000-0x000000007bffffff], contact BIOS vendor for fixes
[ 0.136276] Memory: 6793776K/7133300K available (22221K kernel code, 4652K rwdata, 16296K rodata, 5264K init, 4212K bss, 326184K reserved, 0K cma-reserved)

[Ponce-De-Leon]

Welcome to the Forum!

Are there 2 totally different RAM Sticks put in?

[Aravisian]

@ddelmege

[ 0.136276] Memory: 6793776K/7133300K available (22221K kernel code, 4652K rwdata, 16296K rodata, 5264K init, 4212K bss, 326184K reserved, 0K cma-reserved)

Your total RAM is never all available on any operating system. Some must be reserved for critical system components , so this kind of message is normal.

@ddelmege

[ 0.071298] DMAR: [Firmware Bug]: No firmware reserved region can cover this RMRR [0x0000000079800000-0x000000007bffffff], contact BIOS vendor for fixes

Now - the missing ten gigs...
When you put in the new RAM sticks, are there only Two Slots?
If more than Two, did you leave an empty slot between them (If not, you should).

Try using the Grub parameter intel_iommu=off to bypass this firmware bug. Sadly, if your BIOS is fully up to date, you cannot update the BIOS Firmware to resolve this... so disabling IOMMU becomes your workaround.

[HOW TO] add a grub parameter

There may be times that a user must add a specialized grub parameter in order to overcome an issue. The purpose of this guide is not to provide parameters, as that would be a case by case basis. It is to provide a guide on how to add one. To add a parameter, in a terminal (TTY, Recovery Prompt or Terminal Emulator) run: sudo nano /etc/default/grub Arrow key down to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" and place your parameter within the quotation tags. For example if you are adding th…

Note that you are using intel_iommu=off and not nomodeset.

[bogdansaniuta]

Hola amigo si estas en zorrin has esto click derecho no izquerdo sobre la barra del menu de inicio pero en medio entre reloj y hay una barra continuada ahi click derecho system monitor ahi vera cuanta ram ocupa y cierto total si muesta 16 esta bien aunque el sistema aveces confunde algo y no usa su totalidad de la ram yo por ejemplo tengo 2 modulos de 32 G Ram total 64 Gb Ram tengo y tengo el total.