> > Looks like driver interrupts, on cpu #0, and at IPL 4.
> > 
> > What interrupts are bound to cpu 0 / IPL 4, on your
> > machine?  This information is printed by 
> > 
> >     echo ::interrupts | mdb -k
> 
> This is whole lot while 'sane' (close to 0 CPU use):
> IRQ  Vect IPL Bus    Trg Type   CPU Share APIC/INT# ISR(s) 
> ...
> 25   0x30 4   PCI    Edg MSI    0   1     -         pepb_intr_handler

So it could be related to PCI-e / PCI bus bridge;
maybe some hotplug or power management event interrupt.

The five minute delay could be a hint that it is related to
power management.  Are there perhaps BIOS setup options
to enabled / disable power management for PCI-e devices?
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