Re: [RFC 0/4] dynamically allocate arch specific system vectors

Ingo Molnar
2008-09-16T08:25:31Z

* Dean Nelson <dcn@sgi.com> wrote:

> > while i understand the UV_BAU_MESSAGE case (TLB flushes are
> > special), why does sgi-gru and sgi-xp need to go that deep? They are
> > drivers, they should be able to make use of an ordinary irq just
> > like the other 2000 drivers we have do.
>
> The sgi-gru driver needs to be able to allocate a single irq/vector
> pair for all CPUs even those that are not currently online. The sgi-xp
> driver has similar but not as stringent needs.

why does it need to allocate a single irq/vector pair? Why is a regular
interrupt not good?

Ingo