I´ve also seen BIOS images which contain different information for interrupt routings for mptable and ACPI. Thankfully the vendor was quick to rectify that. Disabling APIC and HTT in the BIOS worked around the issues in my case but did not produce the performance I was looking for.
I'm looking a t a similar system right now and it definitely looks like an interrupt routing problem, not a driver problem. The interesting thing is that (with 5.2-current as of two days ago) disabling neither
ACPI nor APIC helps. I guess that we might want to get John Baldwin
involved.
Pete
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