[Bug 265714] igc(4) drops link under high traffic

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=265714

--- Comment #81 from Kevin Bowling <[email protected]> ---
(In reply to Tomasz "CeDeROM" CEDRO from comment #80)
In your two new dumps the evidence is still RDH == RDT, that shouldn't happen
during operation and it didn't only happen on queue 0 on the first stall.  One
continuing oddity in all your dumps is PCIe/AER error so I would not rule out
faulty HW (which could be the NIC or the mainboard) but they aren't indicating
TLP errors or anything really conclusive.

You could try these to see if we catch it on the igc side:
https://cgit.freebsd.org/src/commit/?id=bbf93227fe9ee1f38b7db5477398c3564e5c84bc
https://cgit.freebsd.org/src/commit/?id=9f7633b932954162792e2caef4f6f0cd87e82f43

but I don't think the issue the first one covers would be that common.

Is the iommu active?

sysctl hw.iommu
sysctl dev.dmar
kenv | egrep 'iommu|dmar'
dmesg -a | egrep -i 'dmar|iommu|fault|remap|vbox|vmm'
kldstat
ps auxww | egrep -i 'vbox|virtualbox'
ifconfig -a
pciconf -t -v

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