[PATCH V2] nvme-pci: assign separate irq vectors for adminq and ioq0

[Sagi Grimberg]

> Note that we originally allocates irqs this way, and Keith changed
> it a while ago for good reasons.  So I'd really like to see good
> reasons for moving away from this, and some heuristics to figure
> out which way to use.  E.g. if the device supports more irqs than
> I/O queues your scheme might always be fine.

I still don't understand what this buys us in practice. Seems redundant
to allocate another vector without any (even marginal) difference.