Am Freitag, 30. Mai 2008 schrieb Rusty Russell:
> It turns out that life is simpler if the host similarly ignores
> callback suppression when the ring is completely empty: the network
> driver wants to free up old packets in a timely manner, and otherwise
> has to use a timer to poll.
>
> We have
virtio allows drivers to suppress callbacks (ie. interrupts) for
efficiency (no locking, it's just an optimization).
There's a similar mechanism for the host to suppress notifications
coming from the guest: in that case, we ignore the suppression if the
ring is completely full.
It turns out that
