NMI watchdog

[John Sigler <linux.kernel@free.fr>]

Hello,

I'm experiencing a full system lockup. I'm using an out-of-tree driver 
which I suspect is responsible. I'm trying to enable the NMI watchdog.

# cat /proc/version
Linux version 2.6.22.1-rt9 (gcc version 3.4.6) #1 PREEMPT RT Tue Oct 9 
12:25:47 CEST 2007

# cat /proc/cmdline
ro root=/dev/hdc1 console=ttyS0,57600n8 console=tty0 panic=3 apic=debug 
nmi_watchdog=2

However, after boot, the NMI count does not change.

# cat /proc/interrupts ; sleep 10 ; cat /proc/interrupts
           CPU0
  0:         99   IO-APIC-edge      timer
  4:       3822   IO-APIC-edge      serial
  8:          1   IO-APIC-edge      rtc
  9:          0   IO-APIC-fasteoi   acpi
 15:      16443   IO-APIC-edge      ide1
 16:       2166   IO-APIC-fasteoi   eth0
 17:        840   IO-APIC-fasteoi   eth1
 18:        840   IO-APIC-fasteoi   eth2
 19:        840   IO-APIC-fasteoi   eth3
 20:          0   IO-APIC-fasteoi   Dta1xx
 21:          0   IO-APIC-fasteoi   Dta1xx
NMI:       2895
LOC:     168445
ERR:          0
MIS:          0

           CPU0
  0:         99   IO-APIC-edge      timer
  4:       3822   IO-APIC-edge      serial
  8:          1   IO-APIC-edge      rtc
  9:          0   IO-APIC-fasteoi   acpi
 15:      16467   IO-APIC-edge      ide1
 16:       2173   IO-APIC-fasteoi   eth0
 17:        845   IO-APIC-fasteoi   eth1
 18:        845   IO-APIC-fasteoi   eth2
 19:        845   IO-APIC-fasteoi   eth3
 20:          0   IO-APIC-fasteoi   Dta1xx
 21:          0   IO-APIC-fasteoi   Dta1xx
NMI:       2895
LOC:     169448
ERR:          0
MIS:          0

Does this mean the NMI watchdog is not working correctly on my system?

# dmesg | grep NMI
ACPI: LAPIC_NMI (acpi_id[0x00] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x01] high edge lint[0x1])
Testing NMI watchdog ... OK.

Regards.
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