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Add info about larger swiotlb value

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Enjeck Cleopatra 2020-10-19 15:11:38 +01:00 committed by GitHub
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user/troubleshooting/pci-troubleshooting.md
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@ -18,6 +18,8 @@ To change this allocation, edit VM's kernel parameters (this is expressed in 512
kernelopts : iommu=soft swiotlb=2048 (default)
# qvm-prefs -s netvm kernelopts "iommu=soft swiotlb=8192"
The `8192` value is the default value and some devices may require a larger value (like `16384`).
## PCI Passthrough Issues ##
Sometimes the PCI arbitrator is too strict, which may cause errors such as `Unable to reset PCI device` and other PCI-related errors.