DragonFly users List (threaded) for 2006-06
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Re: Argh, Stray interrupts 2006
--- Matthew Dillon <dillon@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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