Ok making some progress now, disabling msix by setting hw.igb.enable_msix=0
in /boot/loader.conf fixes the stalls, so I'm guessing this indicates a
driver issue?
My current test case is a repeating scp of the freebsd iso from 3 local
machines + 1 remote to the target machine, which seems to be enough to
reproduce the stall within ~30mins if its going to happen.
I also tried setting hw.igb.num_queues=1 with msix enabled but I was still
able to create a stall with this config.
Is there some debugging I can do to help track this down?
Regards
Steve
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