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

[Kalin KOZHUHAROV]

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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