My network keep dropping out using the iwlwifi driver, adding the following kernel parameters fixed the problem.

To get rid of "iwlwifi 0000:03:00.0: DMA: Out of SW-IOMMU space for 4096 bytes" errors I increased the buffer size.

swiotlb=32768

I was getting the following PCI error.

kernel: pcieport 0000:00:1b.0: PCIe Bus Error: severity=Corrected, type=Physical Layer, id=00d8(Receiver ID) kernel: pcieport 0000:00:1b.0: device [8086:a167] error status/mask=00000001/00002000 kernel: pcieport 0000:00:1b.0: [ 0] Receiver Error (First)

Turning off active power management got rid of the error.

pcie_aspm=off

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