Re: [2.6.7] Ehci controller interrupts like crazy on nforce2

Kalin KOZHUHAROV
2004-07-09T03:10:40Z

Jonathan Filiatrault wrote:
> Here it is: another nforce2 hardware bug. The ehci controller seems to
> send a massive number of interrupts to the kernel (264379 per second).
> This uses about 5 to 10% of the cpu. This shows up in top in the
> "hi"(hard interrupts) indicator. Nothing unusual shows up in the kernel
> log. My system has an Asus A7N8X Nforce2 Board with an Athlon XP 2800+
> mounted on it.
Well, I have the same system (board is Deluxe version) and no such situation.

> [joe@omega3:~]$ cat /proc/interrupts ; sleep 1; cat /proc/interrupts
> CPU0
> 0: 583513 XT-PIC timer
Hmm, I don't have this though. "IO-APIC-edge timer" is the closest in my box.

> 1: 1279 IO-APIC-edge i8042
> 7: 137293 IO-APIC-edge parport0
> 8: 0 IO-APIC-edge rtc
> 9: 0 IO-APIC-level acpi
> 14: 41463 IO-APIC-edge ide0
> 15: 23 IO-APIC-edge ide1
> 17: 9 IO-APIC-level EMU10K1
> 18: 18584 IO-APIC-level eth0
> 20: 121541873 IO-APIC-level ehci_hcd
> 21: 0 IO-APIC-level ohci_hcd
> 22: 0 IO-APIC-level ohci_hcd
> NMI: 0
> LOC: 583348
> ERR: 0
> MIS: 0
[snip]
> 20: 121806252 IO-APIC-level ehci_hcd
[snip]
> Any help or random thougths are welcome.

Well, the "usual answer" is try enable/disable PREEMPT, upgrade BIOS.
Also IO-APIC and APIC as a whole.

Here is my board:
$ cat /proc/interrupts
CPU0
0: 415667195 IO-APIC-edge timer
1: 184380 IO-APIC-edge i8042
8: 2 IO-APIC-edge rtc
9: 0 IO-APIC-level acpi
14: 865112 IO-APIC-edge ide0
15: 9195 IO-APIC-edge ide1
19: 31371344 IO-APIC-level nvidia
20: 8356973 IO-APIC-level ehci_hcd, NVidia nForce2, eth0
21: 0 IO-APIC-level ohci_hcd
22: 798076 IO-APIC-level ohci_hcd
NMI: 0
LOC: 415691931
ERR: 0
MIS: 0
$ bash -c 'cat /proc/interrupts ; sleep 1; cat /proc/interrupts'| grep ehci
20: 8357517 IO-APIC-level ehci_hcd, NVidia nForce2, eth0
20: 8357530 IO-APIC-level ehci_hcd, NVidia nForce2, eth0

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