[ntp:questions] Timekeeping broken on Windows XP with multimedia timer enabled (-M option)

Martin Burnicki martin.burnicki at meinberg.de
Tue Jan 26 08:48:57 UTC 2010

Evandro Menezes wrote:
> On Jan 25, 8:15 am, Martin Burnicki <martin.burni... at meinberg.de>
> wrote:
>> Yes, it helps indeed ;-)
> I'm glad it does.
> And just for completion, the current generation of AMD processors
> derive the CPU clock from the memory controller clock instead of the
> FSB.  Moreover, the memory controller clock may also be changed on the
> fly and is thus subject to power management policies too, effectively
> making its TSC not invariant if the memory controller power is
> managed.  However, I don't know of any OS that does this yet.

Argh, I just began to hope things could become easier in the future. I'm
sure the OS maintainers will find a way to fiddle with this to degrade
timekeeping ;-)

Martin Burnicki

Meinberg Funkuhren
Bad Pyrmont

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