GTR 9 Pro IOMMU bios options

DrDre

Hey @Beelink CS-George . I noticed that when disabling IOMMU under OS options, we get a measurable performance increase, about 6-12%. Currently the option to disable IOMMU in bios is grayed out, is there a reason for that?

(NOTE: for readers of this post, IOMMU is necessary for virtualization and VMs. If you’re making use of these features then you can’t disable.)

Beelink CS-George

Hello there,

Please press delete key as soon as you turn on the PC, so that you can go to BIOS. Please send us a picture of the Main page.
We will check if you need to update the BIOS.

Please repeatedly press delete key as soon as you turn on the PC, go to BIOS. On Save&Exit page, please click Restore defaults, press enter to confirm, then press F4 to save.

DrDre

@Beelink CS-George The bios version is the latest
As can be seen below, the bios IOMMU setting is set to auto without option to change:

I would upload higher resolution images but we’re limited to 120kb in the forum

Tetramatrix

Beelink CS-George This ^ must be an error?! Latest bios is P108 and the link isn’t working either !?

Beelink CS-George

Hi there, sorry for the last message, the 106 version cannot enable the IOMMU, we will update the BIOS once it is available.

ibrahim

HI what update will fix IOmmu because it still disable and i want to do passthrough

Beelink CS-Ian Chan

ibrahim
Hi , there
Your BIOS is the latest .

Please BIOS reset
Please go to BIOS save&exit page, reset to the default .

Rong

ibrahim IOMMU==Auto means enabled here. If you can’t use IOMMU, it’s probably disabled by the OS.

Beelink CS-Ian Chan

Rong
Hi , there
thanks for sharing

jotapesse

Currently the option to disable IOMMU in bios is grayed out, is there a reason for that?

HI what update will fix IOmmu because it still disable and i want to do passthrough

Rong I believe that what @ibrahim meant was that it is still “disabled” (or greyed out) the option to fully disable IOMMU within the BIOS/UEFI - also as indicated by the original post. Alternatively as a workaround and to use IOMMU passthrough on Linux we can set it via a kernel boot commandline option flag/parameters: iommu=pt.

By the way, in my case and on NixOS Linux starting with kernel 6.19.0 - I was required to do it - otherway the system will not boot at all due to some issue on that IOMMU handling leading to a failure to start the NVMe controller and boot the system partition. I have posted about it here.

ibrahim

jotapesse
Hi @jotapesse, thanks for pointing out the iommu=pt flag.
I just updated my BIOS to the latest version, but unfortunately, the IOMMU setting is still greyed out. It’s a bit disappointing as I’m currently running Ubuntu but was planning to migrate to Proxmox to set up several VMs for my home lab.
My goal is to use GPU passthrough for a cloud gaming setup and to provide hardware acceleration for AI workloads in specific VMs. I’m really hoping to get this working , If you Have any tips could share me.

thank you @jotapesse

jotapesse

I believe the iommu=pt flag should work fine for your purpose, but other than that my best advce would be that it’s best to search for dedicated online tutorials for those systems.