[ntp:questions] peers with high offset on Intel Quad Core running Windows 2003

Martin Burnicki martin.burnicki at meinberg.de
Thu Aug 21 11:31:15 UTC 2008


David Woolley wrote:
> Richard B. Gilbert wrote:
>> Also note that Windows is a difficult environment!  The clock ticks at
>> something like 17 millisecond intervals.  If you really need/want time
> Recent versions of ntpd force multi-media timers on, which reduces the
> interval between ticks, at the cost of an increased risk in lost ticks.

This is not quite correct. Even older versions of the NTP port for Windows
have tried to interpolate the timer ticks using the performance counter.

Recent versions can optionally set the Windows multimedia timer to highest
resolution because otherwise the Windows system time would seem to step
back and forth when another application which makes use of the multimedia
timer was started/stopped. So this is just another workaround for
constrains due to Windows.

This workaround is enabled by default if NTP is installed using the GUI
setup program available from Meinberg, but can also be disabled during

Martin Burnicki

Meinberg Funkuhren
Bad Pyrmont

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