IOMMU Error At Boot Time

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Hi all!

I’ve just recently noticed these lines in the dmesg output:

Please enable the IOMMU option in the BIOS setup This costs you 64 MB of RAM

they may have been there forever, but I never noticed them before. This system is an AMD Phenom-II X2 CPU on a Gigabyte MA770-UD3 motherboard.

I have no idea which BIOS option I need to change to solve this, I see nothing in the setup that refers to IOMMU.

Clues, please?


One thought on - IOMMU Error At Boot Time

  • The IOMMU supports I/O virtualization. As far as I can tell your motherboard’s chipset does not implement an IOMMU, they’re not all that common on desktop systems.

    You can probably just ignore this message.