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Hi, i need to enable IOMMU to get a improve in performance of virtualizations, but i can't enable, it's give the error:
pci 0000:00:00.2: AMD-Vi: Unable to read/write to IOMMU perf counter.
Using journalctl | grep IOMMU returns:
mar 14 17:15:53 yuri kernel: pci 0000:00:00.2: AMD-Vi: Unable to read/write to IOMMU perf counter.
mar 14 17:15:53 yuri kernel: pci 0000:00:00.2: AMD-Vi: Found IOMMU cap 0x40
mar 14 17:15:53 yuri kernel: AMD-Vi: AMD IOMMUv2 driver by Joerg Roedel <jroedel@suse.de>
mar 14 17:22:41 yuri kernel: pci 0000:00:00.2: AMD-Vi: Unable to read/write to IOMMU perf counter.
mar 14 17:22:41 yuri kernel: pci 0000:00:00.2: AMD-Vi: Found IOMMU cap 0x40
mar 14 17:22:41 yuri kernel: AMD-Vi: AMD IOMMUv2 driver by Joerg Roedel <jroedel@suse.de>
mar 14 17:23:54 yuri kernel: pci 0000:00:00.2: AMD-Vi: Unable to read/write to IOMMU perf counter.
mar 14 17:23:54 yuri kernel: pci 0000:00:00.2: AMD-Vi: Found IOMMU cap 0x40
mar 14 17:23:54 yuri kernel: AMD-Vi: AMD IOMMUv2 driver by Joerg Roedel <jroedel@suse.de>
mar 14 17:26:50 yuri kernel: pci 0000:00:00.2: AMD-Vi: Unable to read/write to IOMMU perf counter.
mar 14 17:26:50 yuri kernel: pci 0000:00:00.2: AMD-Vi: Found IOMMU cap 0x40
mar 14 17:26:50 yuri kernel: AMD-Vi: AMD IOMMUv2 driver by Joerg Roedel <jroedel@suse.de>
mar 14 17:54:13 yuri kernel: pci 0000:00:00.2: AMD-Vi: Unable to read/write to IOMMU perf counter.
mar 14 17:54:14 yuri kernel: pci 0000:00:00.2: AMD-Vi: Found IOMMU cap 0x40
mar 14 17:54:14 yuri kernel: AMD-Vi: AMD IOMMUv2 driver by Joerg Roedel <jroedel@suse.de>
mar 14 20:28:09 yuri kernel: pci 0000:00:00.2: AMD-Vi: Unable to read/write to IOMMU perf counter.
mar 14 20:28:09 yuri kernel: pci 0000:00:00.2: AMD-Vi: Found IOMMU cap 0x40
mar 14 20:28:09 yuri kernel: AMD-Vi: AMD IOMMUv2 driver by Joerg Roedel <jroedel@suse.de>
mar 14 22:35:55 yuri kernel: pci 0000:00:00.2: AMD-Vi: Unable to read/write to IOMMU perf counter.
mar 14 22:35:55 yuri kernel: pci 0000:00:00.2: AMD-Vi: Found IOMMU cap 0x40
mar 14 22:35:55 yuri kernel: AMD-Vi: AMD IOMMUv2 driver by Joerg Roedel <jroedel@suse.de>
mar 14 23:04:38 yuri kernel: pci 0000:00:00.2: AMD-Vi: Unable to read/write to IOMMU perf counter.
mar 14 23:04:38 yuri kernel: pci 0000:00:00.2: AMD-Vi: Found IOMMU cap 0x40
mar 14 23:04:38 yuri kernel: AMD-Vi: AMD IOMMUv2 driver by Joerg Roedel <jroedel@suse.de>
My hardware are:
Motherboard: Biostar B350GT3 (i'm using the last bios)
CPU: AMD Ryzen 5 2400G (yes i'm using the integrated graphics)
I'm using the mesa drivers that Lutris recommends to install (i play overwatch some times)
And this is my GRUB_CMDLINE_LINUX_DEFAULT:
GRUB_CMDLINE_LINUX_DEFAULT="loglevel=3 amd_iommu=on iommu=pt"
I'm using the Kernel Linux 5.11.6-arch1-1 without any modifications
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Try 5.12-rc3 or cherry-pick https://git.kernel.org/pub/scm/linux/ke … cf2657fd9b
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Make sure you enable IOMMU in BIOS aswell as stated in the guide.
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