[2.6.7] Ehci controller interrupts like crazy on nforce2

Jonathan Filiatrault
2004-07-09T01:16:55Z

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.

[joe@omega3:~]$ cat /proc/interrupts ; sleep 1; cat /proc/interrupts
CPU0
0: 583513 XT-PIC timer
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
CPU0
0: 584760 XT-PIC timer
1: 1280 IO-APIC-edge i8042
7: 137578 IO-APIC-edge parport0
8: 0 IO-APIC-edge rtc
9: 0 IO-APIC-level acpi
14: 41505 IO-APIC-edge ide0
15: 23 IO-APIC-edge ide1
17: 9 IO-APIC-level EMU10K1
18: 18641 IO-APIC-level eth0
20: 121806252 IO-APIC-level ehci_hcd
21: 0 IO-APIC-level ohci_hcd
22: 0 IO-APIC-level ohci_hcd
NMI: 0
LOC: 584595
ERR: 0
MIS: 0
[joe@omega3:~]$

Any help or random thougths are welcome.

Happy Hacking,
Joe