Re: IRQ issues, (nobody cared, disabled), not USB

[Christopher Swingley]

Len,

* Len Brown <len.brown@xxxxxxxxx> [2004-Jul-10 18:48 AKDT]:
> It would be interesting if the IRQ failure was always on IRQ7.
> 
> When you moved slots, did the device move to a different
> IRQ and fail there too?

I can't remember for sure.  My system logs go back to June, and all of 
the errors back to then are on IRQ 7.  But I don't remember when I tried 
a different slot.

> Running ACPI, you may be able to move that device off of
> IRQ7 with "acpi_irq_balance" plus "acpi_isa_irq=7".

I'm giving this a go now that 2.6.5 didn't help.  With these parameters, 
/proc/interrupts looks like:


           CPU0       
  0:     509088          XT-PIC  timer
  1:       2408          XT-PIC  i8042
  2:          0          XT-PIC  cascade
  8:          4          XT-PIC  rtc
  9:          0          XT-PIC  acpi
 10:      41821          XT-PIC  eth0, mga@PCI:1:0:0
 11:          0          XT-PIC  uhci_hcd, uhci_hcd, uhci_hcd, EMU10K1, eth1
 12:       2102          XT-PIC  i8042
 14:     236597          XT-PIC  ide0
 15:        328          XT-PIC  ide1
NMI:          0 
LOC:     509008 
ERR:       1693
MIS:          0

Seems like a lot of stuff on IRQ 11. . .

> Hardware routes spurious interrupts to IRQ7, so your
> device may be an innocent victim of those.  Also,
> there may be some motherboard device pulling on IRQ7
> that Linux doesn't know about -- so see if you can
> disable any extra motherboard devices in BIOS setup.

I already have everything I'm not using (serial, parallel ports) 
disabled.

> Finally, you might run a kernel with the IOAPIC enabled,
> such as the CONFIG_SMP kernel, to see if you have an
> IOAPIC on the board and if that mode works differently.

I'll maybe give that a try at some point, if the IRQ balancing doesn't 
help.

Thanks again,

Chris
-- 
Christopher S. Swingley          email: cswingle@xxxxxxxxxxxx (work)
Intl. Arctic Research Center            cswingle@xxxxxxxxx (personal)
University of Alaska Fairbanks   www.frontier.iarc.uaf.edu/~cswingle/

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