Obscure errors in dmsg, system instability

Doug White dwhite at gumbysoft.com
Sat Sep 25 13:29:24 PDT 2004

On Thu, 23 Sep 2004, [ISO-8859-1] Eirik =D8verby wrote:

> On 23. Sep 2004, at 04:15, Doug White wrote:
> > Is something sharing an interrupt with that device?
> >
> > PCI bus errors are generally Bad News .. either some device or the
> > mobo is inroducing errors.
> Well.. Yes, there is some interrupt sharing. Relevant parts of dmsg:
> [ltning at carnen] ~$ dmesg | grep "irq 2"
> IOAPIC #0 intpin 19 -> irq 2
> uhci0: <Intel 82371AB/EB (PIIX4) USB controller> port 0xd400-0xd41f irq
> 2 at device 4.2 on pci0
> ahc0: <Adaptec aic7890/91 Ultra2 SCSI adapter> port 0xd000-0xd0ff mem
> 0xe2000000-0xe2000fff irq 2 at device 6.0 on pci0
> amr0: <LSILogic MegaRAID> mem 0xe3000000-0xe300ffff irq 2 at device 9.1
> on pci0

Apparently one of these devices doesn't like getting an interrupt when
there's no data pending. It might be a FreeBSD driver bug, but being a
3-way share it'll make it hard to untangle.

> I don't like the fact that the LSI and the Adaptec are sharing IRQs,
> given that the LSI is the main system drive controller (which is why I
> don't use the Adaptec at all - and it cannot be disabled in BIOS I
> think!)...
> I should perhaps try to reallocate some of the IRQs, but I don't really
> have a clue how to do that, since I have no VGA in that box.. Ohwell, I
> guess I just have to rip it open ;)

Yah .. rearrange the cards in the slots and see what you can convince it
to do.

Doug White                    |  FreeBSD: The Power to Serve
dwhite at gumbysoft.com          |  www.FreeBSD.org

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