...
On the booted machine the useful qemu and xen logs will be located under /var/log/xen/*
PCIe
PCIe AER events flood
It is observed that some PCIe cards might have issues negotiating power management policies and may produce AER events/messages under old UEFI firmware (1.x.y.z-something). The latest firmwares does not have this issue. There is an option in BIOS to handle such messages in firmware instead but it is untested.
However, the PCIe ASPM can be disabled via Linux kernel cmdline:
| Code Block |
|---|
pcie_aspm=off |
The AER messages also could be suppressed using:
| Code Block |
|---|
pci=noaer |
The https://docs.ipi.wiki/com-hpc/ava/firmware_A2Versions.html suggests that AER events can be caused by incorrect payload size which can be re-configured in BIOS.
PCIe speed
By default BIOS/UEFI sets the PCIe speeds to Gen3. There are options in BIOS/UEFI interface to enable Gen4 speed. There is no information if anyone tested this but it should work in theory. In case of potential performance impact, the Gen4 speed could be tested.
PCIe-to-NVMe adapter card
Such card was tested and it worked. I was able to use 3 NVMe disks at some point when 3rd NVMe was connected via pcie-to-nvme card.
SATA ports on motherboard
...