F5F Stay Refreshed Hardware Desktop MSI X470 Gaming Plus includes IOMMU groups for enhanced performance.

MSI X470 Gaming Plus includes IOMMU groups for enhanced performance.

MSI X470 Gaming Plus includes IOMMU groups for enhanced performance.

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Triffuny
Junior Member
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6
11-30-2018, 05:59 AM
#1
You're facing a common challenge with PCI-E lanes and IOMMU configuration. The issue likely stems from how PCI-E lanes are allocated and managed by the motherboard firmware. Moving your GPU to PCI_E6, which connects to a PCH controller, could potentially free up lanes for other devices, but it depends on the chipset's flexibility. Since both PCI_E1 and PCI_E4 are tied to the CPU, they remain linked regardless of slot changes. Checking the motherboard manual around page 30 should clarify the PCI layout and lane availability. Regarding performance, Gen 2.0 x 4 slots generally support higher bandwidth, so a slight drop might occur only under heavy workloads—regular tasks should be fine. Let me know if you need further guidance!
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T
Triffuny
11-30-2018, 05:59 AM #1

You're facing a common challenge with PCI-E lanes and IOMMU configuration. The issue likely stems from how PCI-E lanes are allocated and managed by the motherboard firmware. Moving your GPU to PCI_E6, which connects to a PCH controller, could potentially free up lanes for other devices, but it depends on the chipset's flexibility. Since both PCI_E1 and PCI_E4 are tied to the CPU, they remain linked regardless of slot changes. Checking the motherboard manual around page 30 should clarify the PCI layout and lane availability. Regarding performance, Gen 2.0 x 4 slots generally support higher bandwidth, so a slight drop might occur only under heavy workloads—regular tasks should be fine. Let me know if you need further guidance!

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Cefreak113
Senior Member
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484
11-30-2018, 06:24 AM
#2
I successfully installed the ACS override patch on Xubuntu. It seems the issue wasn't present on Pop due to its systemd-boot setup, and even when GRUB was selected, update-initramfs continued using systemd-boot parameters instead of GRUB ones. Now I’m experiencing a strange problem where my Linux desktop becomes unresponsive after some time, while my Windows VM with GPU is functioning normally. Anyone has any insights?
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C
Cefreak113
11-30-2018, 06:24 AM #2

I successfully installed the ACS override patch on Xubuntu. It seems the issue wasn't present on Pop due to its systemd-boot setup, and even when GRUB was selected, update-initramfs continued using systemd-boot parameters instead of GRUB ones. Now I’m experiencing a strange problem where my Linux desktop becomes unresponsive after some time, while my Windows VM with GPU is functioning normally. Anyone has any insights?

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