[illumos-Developer] Available MSI(-x) interrupt limit.

[Alexey Zaytsev]

On Tue, Jun 7, 2011 at 22:35, Garrett D'Amore <garrett at nexenta.com> wrote:
> Two is very sensible.  It comes from NICs.  One for transmit, one for receive. :-)   It also is unlikely to be large enough to lead to interrupt resource exhaustion.
>
> In illumos, the default is higher.  Allocating more in older revs (say NexentaStor 3.x) requires a property change.

Am I missing something? The default seems to be 2, and that's the
behavior I'm seeing. For my case, the device provides 3 MSIs. One
additional for device state changes, like the (virtual) link going
down. I'll probably use polling for this stuff anyway, but it just
caught my attention.