Interrupt storm

[John Baldwin]

On Saturday 09 April 2005 05:57 am, Antoine Brodin wrote:
> John Baldwin <jhb at FreeBSD.org> wrote:
> > I think your other link devices are meant to be used in APIC mode (note
> > their names start with 'A') and thus I think they are aliases for the
> > other link devices.  So when I turn off the alias, I turn off the
> > non-APIC mode one as well.  Working BIOSen handle this by having the same
> > link device change its behavior (different _PRS return values) depending
> > on the PIC mode.  It's not easy to determine if a link is just not used
> > (for example, if no card is plugged into a slot with a dedicated link) or
> > if it's an alias.  I think having two ACPI devices alias to the same
> > hardware is a bug in the BIOS though.  Perhaps your BIOS vendor can be
> > convinced to fix this.  Can you see if Linux has the same problem btw?
>
> I've just sent a technical support request to ASUS. I'll let you know
> when they reply.
> Linux doesn't have the same problem: I tested with a knoppix live cd
> yesterday.
> dmesg: http://bsd.miki.eu.org/~antoine/knoppix36.dmesg , but it doesn't
> look very helpful.

Actually, it is.  What Linux is doing is probing all the link devices before 
it probes any PCI devices, so all the _DIS calls happen before any interrupts 
are routed.  I believe Nate knows how to get FreeBSD to do something similar 
via a hack.

-- 
John Baldwin <jhb at FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org