[ntp:questions] Selection and Clustering of candidates

Mischanko, Edward T Edward.Mischanko at arcelormittal.com
Sun Jun 26 10:45:12 UTC 2011


Dave,

I changed my configuration, but there is no change in operation

# Miscellaneous stuff
tinker allan 7
tos maxclock 5 minsane 3

As for my question on server selection, all these servers are routers on
a corporate network.  If 6 servers have the same offset and 3 do not
which ones would you choose?  I choose the 6 servers with the same
offset.

-----Original Message-----
From: questions-bounces+edward.mischanko=arcelormittal.com at lists.ntp.org
[mailto:questions-bounces+edward.mischanko=arcelormittal.com at lists.ntp.o
rg] On Behalf Of David Woolley
Sent: Sunday, June 26, 2011 4:04 AM
To: questions at lists.ntp.org
Subject: Re: [ntp:questions] Selection and Clustering of candidates

Mischanko, Edward T wrote:
> Some of the servers
> NTP selects have offsets that are higher than the majority;

These might be the ones with the most correct time.  A high offset only 
indicates a poor time if you are certain that the local time is 
absolutely correct.

>  Why are they being selected?

Because they have times that are consistent with the times from all the 
other selected ones and NTP_MAXCLOCKS in ntpd.h hasn't been reached.

> Why are so many being selected when I really want the best 5 or 6.

How is ntpd to determine that they are the best ones.  A high offset may

simply mean the local time is wrong.

> 
> # Miscellaneous stuff
> tinker allan 7
> tos minclock 4 minsane 3

It is tos maxclock, but it doesn't seem to be documented in at least 
some versions of the HTML.

>> I changed my configuration, but there is no change in operation
>> # Miscellaneous stuff
>> tinker allan 7
>> tos maxclock 5 minsane 3

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