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NMI watchdog not ticking at the right intervals

DISCUSSION Corey Minyard 2 participants 2 messages Oct 25, 2002

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Corey Minyard

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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

#1 lore raw
Quoted 8 lines · Corey Minyard

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?

That seems unlikely. It is driven by the performance counter stuff which is clocked at TSC rates. It could be that it is not being set up properly to count every event.

-g

Quoted 31 lines

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

(quoted diff) +0 -2
-Corey
 
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