RE: [Xen-devel] Interrupt forwarding

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> > We don't go that far. A sensible approach would be to require the
> > driver to be restarted, and to reset the hardware device, before
> > unmasking. Or to rate limit each interrupt line to an
> > administrator-configurable 'reasonable' number of IRQs per second --
> > this might also catch bugs where drivers are not properly acking
> > devices for other reasons.
> 
> In x86 boxes almost everything is shared. Leaving the interrupt masked
> off will probably disable 20% of the hardware in the box.

That's not my experience, certainly on modern server hardware. On
systems with an IOAPIC its rare to see a shared interrupt, and even if
you do you can typically avoid it just by swapping a couple of PCI cards
around.

Ian


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