Re: Possible cause of "spurious APIC interrupt"

Vadim E. Kogan (vadim@vadim.gem.net)
Sat, 23 May 1998 16:44:02 -0700

Andre M. Hedrick wrote:
>
> "spurious APIC interrupt, ayiee, should never happen."
>
> results of "lspci -vx" v1.03
>
> 00:07.2 USB Controller: Intel Corporation 82371SB PIIX3 USB [Natoma/Triton II]
> (rev 01)
> Flags: bus master, medium devsel, latency 64, IRQ ?
> I/O ports at ef40
> 00: 86 80 20 70 05 00 80 02 01 00 03 0c 00 40 00 00
> 10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 20: 41 ef 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 30: 00 00 00 00 00 00 00 00 00 00 00 00 ff 04 00 00
>
> I have noted that I only get this message if I enable the USB support
> in the BIOS of my P6DNF. It seems that IO-APIC irq-translations
> stick the USB irq at 0xff 255. Since the latest SMP code flags against
> an interrupt of 0xff, this may be the need insight for catching
> and handling that "spurious APIC interrupt".
In my case (same MB, 2 PPro233) I *don't* have USB enabled (at least
it's not in /proc/pci) and I *do* get spurious APIC interrupts. (see my
message several hours ago). Let's check what other common hardware we
have - maybe we'll be able to find the problem.

here's my /proc/pci:
PCI devices found:
Bus 0, device 0, function 0:
Host bridge: Intel 82441FX Natoma (rev 2).
Medium devsel. Fast back-to-back capable. Master Capable.
Latency=32.
Bus 0, device 7, function 0:
ISA bridge: Intel 82371SB PIIX3 ISA (rev 1).
Medium devsel. Fast back-to-back capable. Master Capable. No
bursts.
Bus 0, device 7, function 1:
IDE interface: Intel 82371SB PIIX3 IDE (rev 0).
Medium devsel. Fast back-to-back capable. Master Capable.
Latency=32.
I/O at 0xffa0 [0xffa1].

^^^^ You probably have these 3 + USB ^^^^

Bus 0, device 17, function 0:
Display controller: Matrox Millennium (rev 1).
Medium devsel. Fast back-to-back capable. IRQ 10.
Non-prefetchable 32 bit memory at 0xfebf8000 [0xfebf8000].
Prefetchable 32 bit memory at 0xf6000000 [0xf6000008].

^^^^ souldn't be a problem - especially in text mode, when it's not used
at all.

Bus 0, device 18, function 0:
SCSI storage controller: NCR 53c825 (rev 2).
Medium devsel. IRQ 11. Master Capable. Latency=32.
I/O at 0xec00 [0xec01].
Non-prefetchable 32 bit memory at 0xfebfff00 [0xfebfff00].

^^^^ can be problem. I get more interrupts when doing maxe -j bzImage.
But I also get them even if I do some make on IDE disk.

Bus 0, device 19, function 0:
VGA compatible controller: S3 Inc. Trio32/Trio64 (rev 84).
Medium devsel. IRQ 12.
Non-prefetchable 32 bit memory at 0x80000000 [0x80000000].
^^^^ This is the one that is used when Im in text mode.

Bus 0, device 20, function 0:
Ethernet controller: 3Com 3C905 100bTX (rev 0).
Medium devsel. IRQ 13. Master Capable. Latency=32. Min
Gnt=3.Max Lat=8.
I/O at 0xef00 [0xef01].
^^^^ Hmm... you got some tulip card - DEC or SMC I guess.

/proc/interrupts:
CPU0 CPU1
0: 6573223 2207 XT-PIC timer
1: 28565 25753 IO-APIC-edge keyboard
2: 0 0 XT-PIC cascade
4: 30387 29912 IO-APIC-edge serial
5: 8106 10986 IO-APIC-edge Sound Blaster 16
8: 1 0 IO-APIC-edge rtc
13: 1 0 XT-PIC fpu
14: 25525 27896 IO-APIC-edge ide0
^^^^ your IDEs are level!
17: 2583 2581 IO-APIC-level ncr53c8xx
19: 19070 19051 IO-APIC-level 3c905 Boomerang 100baseTx
NMI: 0
IPI: 0

Character devices:
1 mem
2 pty
3 ttyp
4 ttyp
5 cua
6 lp
^^^^ you don't have that one
7 vcs
10 misc
14 snd

and I don't have netlink. BTW, Im on ALSA (+some changes I made)

Block devices:
2 fd
3 ide0
8 sd

no loop & no ide[123]. BTW, your ide1 isn't in /proc/interrupts...

Vadim

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