Re: NMI watchdog not ticking at the right intervals

[george anzinger <george@mvista.com>]

Corey Minyard wrote:
> 
> 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
> 
> 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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-- 
George Anzinger   george@mvista.com
High-res-timers: 
http://sourceforge.net/projects/high-res-timers/
Preemption patch:
http://www.kernel.org/pub/linux/kernel/people/rml