>> So try unbinding the mac threads; it may help you here.
> How do I do that? All I can find on interrupt fencing and the like is to
> simply set certain processors to no-intr, which moves all of the
> interrupts and it doesn't prevent the xcall storm choosing to affect
> these CPUs either…

In /etc/system:

set mac:mac_soft_ring_thread_bind=0
set mac:mac_srs_thread_bind=0

Reboot required. Verify after reboot with mdb;

echo "mac_soft_ring_thread_bind/D" | mdb -k

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