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vrolife avatar vrolife commented on June 29, 2024

In my laptop(5.17.0-1016-oem), sudo dmesg|grep DMA

[    0.319021] PCI-DMA: Using software bounce buffering for IO (SWIOTLB)

iommu=soft is the default behavior.
AMD document says it is expensive
IOMMU Overview

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vrolife avatar vrolife commented on June 29, 2024

Someone solved this problem by adding "pci=noats" kernel option on Ryzen 3900.
https://www.reddit.com/r/linuxquestions/comments/k3w9zy/has_anyone_gotten_their_ryzen_hardware_iommu_to/

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vrolife avatar vrolife commented on June 29, 2024

After some research, I think iommu=soft does not affect amdgpu. amdgpu uses a dedicated "iommu_v2" module. So this option may not be that expensive

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aimzieslol avatar aimzieslol commented on June 29, 2024

@vrolife If I don't intend to run any virtualization software on the machine, should I not use pci=noats?

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vrolife avatar vrolife commented on June 29, 2024

pci=noats affects DMA mechanism, not virtualization. If any PCI device is not recognized, try this option pci=noats, if everything working, just keep the default value.

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