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SubjectIRQ21 flood on nForce2
Howdy,

I'm getting over 100k interrupts/second on IRQ21 on an nForce2
motherboard any time I have a driver using that interrupt.

Both ehci_hcd and intel_8x0 use that interrupt. When either or both
modules are loaded, it looks like below. With no modules loaded, or with
pci=noacpi, behavior is fine.

I've filed more detail at buzilla, including dmidecode and acpidmp
output:

http://bugzilla.kernel.org/show_bug.cgi?id=2574

Seems like it'd be something with the ACPI/interrupt configuration, yes?

Noel

-------------

cat /proc/interrupts
CPU0
0: 706031 IO-APIC-edge timer
1: 8 IO-APIC-edge i8042
2: 0 XT-PIC cascade
7: 0 IO-APIC-edge parport0
8: 4 IO-APIC-edge rtc
9: 0 IO-APIC-level acpi
12: 50 IO-APIC-edge i8042
14: 4742 IO-APIC-edge ide0
18: 0 IO-APIC-level EMU10K1
19: 3 IO-APIC-level Bt87x audio, bttv0
20: 76147 IO-APIC-level ohci_hcd, eth0
21: 104487700 IO-APIC-level ehci_hcd, NVidia nForce2
22: 0 IO-APIC-level ohci_hcd
NMI: 0
LOC: 705958
ERR: 0
MIS: 0

vmstat 1 10
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
2 0 0 396560 5804 51848 0 0 77 25 27446 46 95 1 3 1
1 0 0 396560 5804 51848 0 0 0 0 117260 9 100 0 0 0
1 0 0 396560 5804 51848 0 0 0 0 117333 8 100 0 0 0
1 0 0 396560 5804 51848 0 0 0 0 117333 6 100 0 0 0
1 0 0 396560 5804 51848 0 0 0 0 117335 8 100 0 0 0
1 0 0 396560 5812 51848 0 0 0 60 117334 12 100 0 0 0
1 0 0 396568 5812 51848 0 0 0 0 117335 8 100 0 0 0
1 0 0 396568 5812 51848 0 0 0 0 117336 10 99 1 0 0
1 0 0 396568 5812 51848 0 0 0 0 117343 6 100 0 0 0
1 0 0 396568 5812 51848 0 0 0 0 117334 6 100 0 0 0

cat /proc/interrupts
CPU0
0: 715191 IO-APIC-edge timer
1: 8 IO-APIC-edge i8042
2: 0 XT-PIC cascade
7: 0 IO-APIC-edge parport0
8: 4 IO-APIC-edge rtc
9: 0 IO-APIC-level acpi
12: 50 IO-APIC-edge i8042
14: 4744 IO-APIC-edge ide0
18: 0 IO-APIC-level EMU10K1
19: 3 IO-APIC-level Bt87x audio, bttv0
20: 77101 IO-APIC-level ohci_hcd, eth0
21: 105550345 IO-APIC-level ehci_hcd, NVidia nForce2
22: 0 IO-APIC-level ohci_hcd
NMI: 0
LOC: 715119
ERR: 0
MIS: 0


--
In this American stoicism, all phenomena of business life however
crooked or foolish work to the prosperity of the universe under a
benign commercial Providence who is part the God of the Bible, and part
pure money.
-- James Buchan, Guardian Unltd, 2002-06-28
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
Noel Maddy <noel@zhtwn.com>
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