Argh, Stray interrupts 2006

[Danial Thom]

OK, it seems that enabling the printer got rid of
the messages. We usually disable the printer port
and remove the printer device and it seems that
DFLY doesn't like that too much.

DT

--- Danial Thom <danial_thom at xxxxxxxxx> wrote:

> 
> 
> --- Matthew Dillon
> <dillon at xxxxxxxxxxxxxxxxxxxx>
> wrote:
> 
> >     A flood of stray irq 7 messages is
> > typically indicative of a BIOS 
> >     SMP configuration problem.  It usually
> > means that the PIC is sending
> >     EXT interrupt acknowledgement requests to
> > several cpus at once (or
> >     to one dual-core cpu), and the BIOS
> hasn't
> > setup the hardware to
> >     properly direct the interrupts to just
> one
> > cpu pin.
> > 
> >     What happens is that one cpu acks the
> > interrupt and clears the pending
> >     bit, then the other cpu tries to ack the
> no
> > longer pending interrupt
> >     and gets the stray interrupt vector.  The
> > stray interrupt vector is
> >     typically an undocumented hardware vector
> > number, usually 7 or 15.
> >     Hence stray irq 7's.
> > 
> >     If you are running dual-core cpu's you
> can
> > try adding this option to
> >     work around the BIOS misconfiguration:
> > 
> >     options         CPU_AMD64X2_INTR_SPAM
> > 
> >     But it may not work on opterons.  The
> > problem is most commonly on 
> >     systems with DUAL-CORE cpu's and BIOSes
> > that don't quite configure
> >     them properly.
> 
> This is a single core 100-series opteron. I
> don't
> have any dual-cores to test with at the moment.
> 
> Its basically a GENERIC kernel (1.5.3-PREVIEW)
> with smp disabled.
> 
> DT
> 
>
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