Iommu on Damien Dye's Blog https://blogs.damiendye.uk/en/tags/iommu/ Recent content in Iommu on Damien Dye's Blog Hugo en-GB Fri, 07 Aug 2026 15:00:00 +0100 Two Boot Lines — Which Kernel Flags Belong on a Proxmox Host, and Which Belong in the Guest https://blogs.damiendye.uk/en/proxmox/kernel-boot-flags-host-guest/ Fri, 07 Aug 2026 15:00:00 +0100 https://blogs.damiendye.uk/en/proxmox/kernel-boot-flags-host-guest/ Most Proxmox tuning lines you find online are one blob of kernel flags. Half of them belong on the hypervisor, half belong inside the guest, two of the popular ones do nothing at all, and a few change meaning depending on which side of the boundary they land. PCIe Passthrough Performance on Proxmox VE — The IOMMU Tax and How to Minimise It https://blogs.damiendye.uk/en/proxmox/pcie-passthrough-performance-the-iommu-tax/ Fri, 07 Aug 2026 10:00:00 +0100 https://blogs.damiendye.uk/en/proxmox/pcie-passthrough-performance-the-iommu-tax/ Why PCIe devices lose throughput when passed through to a VM via VFIO, and the practical tuning steps that claw most of it back.