On 11/19/2017 07:34 AM, Zycorax Tokoroa wrote:
The issue that might have been referred to is a now (in linux 4.12 or 4.13) fixed bug that appeared on Ryzen while using KVM and vfio. Enabling or disabling nested paging in the KVM module lead to a deteriorated performance of either the GPU or the CPU. AFAIK Ryzen is now as good as Intel for hardware passthrough.
Yep.
I have a piledriver previous gen socket G34 CPU and IOMMU has always worked great for me as well, I play games in a VM with no issues and a variety of other attached devices. It is a shame the previous gen sockets never got a CPU with AVIC I would say that is one of the definite advantages of AM4. (the drawback of AM4 is that it has mandatory PSP)
FYI brian "VT-d" is an intel marketing term for IOMMU - AMD's is AMD-Vi - but to make it easy I always refer to it as IOMMU and the graphics support option as IOMMU-GFX.
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