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SubjectRe: NMI watchdog not ticking at the right intervals
On Fri, 25 Oct 2002 09:09:10 -0500, 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?
>
>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

(Me thinks "speedstep?")

Do you boot with nmi_watchdog=1 or 2?
The perfctr + local-APIC driven NMI watchdog is dependent
on the CPU's clock frequency. If this changes, the NMI rate
will change accordingly.

The NMI rate may also be affected by APM/ACPI and how often
the kernel executes HLT.

/Mikael
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