[ntp:questions] NTP - orphan mode with SAME stratum ("tos orphan 6") FAIL to sync.

David J Taylor david-taylor at blueyonder.neither-this-bit.nor-this.co.uk.invalid
Wed Apr 8 05:31:45 UTC 2009

sheikdawoodrajali at gmail.com wrote:
> Steve,
> what do you exactly mean "ultra high quality time"?
> My ntp service is started running the command below:
> "C:\ntp\bin\ntpd.exe" -U 3 -M -g -c "C:\ntp\etc\ntp.conf"
> Are you talking about the -M (Windows only - set high quality
> multimedia timer) option here?

It's one of these "how long is a piece of string" questions!  What 
accuracy do you require?  Within a second, tens of milliseconds, hundreds 
of microseconds?

With Windows XP SP2 or later, the -M option may be required to prevent 
severe variations in the offset value, for example:


By the way, I use MRTG to plot the offsets:


and the Meinberg NTP Time Server Monitor and a program I wrote can read 
the loopstats files to show how well NTP is working:



and I have a simple multi-PC monitor here:



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