NMI watchdog not ticking at the right intervals

From: Corey Minyard (minyard@acm.org)
Date: Fri Oct 25 2002 - 09:09:10 EST


As I have been working on my NMI patch, I have noticed that the NMI
watchdog does not seem to be ticking correctly. I've tried 2.4 and 2.5
kernels, and I get the same results. From my reading of the code, it
should tick once a second. However, I have had the time between ticks
vary from around 33 to over 100 seconds. Tbe time between ticks is
different on every boot, but is consistent once booted. Is there some
divider register that's not getting initialized?

Here's my cpuinfo:

processor : 0
cpu_package : 0
vendor_id : GenuineIntel
cpu family : 6
model : 11
model name : Intel(R) Pentium(R) III Mobile CPU 1066MHz
stepping : 1
cpu MHz : 730.601
cache size : 512 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat pse36 mmx fxsr sse
bogomips : 1458.17

-Corey

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