[asterisk-users] Re: Dell PowerEdge 2950 Sharing NIC IRQ with Digium Card

[Leo Ann Boon]

Matt wrote:
> Leo,
> I am sorry.  Yes I mean IO-APIC.   So basically the output of lspci -v 
> are the same as cat /proc/interrupts. 
>
> It is a riser, I will check on that.
>
> So here's my questions then.  If APIC routes the IRQs to 1-15 for real 
> world use....can you safely have two devices on, say, 14?   APIC will 
> assign one to maybe 23 and one to 20.  But are they really both on 15 
> with a potential for conflict?
The conflict only happens if your OS is not APIC aware or buggy 
hardware. In fact 15, is usually used for the secondary IDE port. The 
reason APIC exists is to support SMP and the plethora of new devices 
that are present on any modern motherboard. On my nforce motherboard 
with IO-APIC, lscpi  -vb will show lots of devices using IRQ 15. But, 
I've never seen IRQ misses on any one of them. The same goes for our 
production systems running Pentium D or Xeon 51x0.

Leo