[ntp:questions] Selection and Clustering of candidates

Mischanko, Edward T Edward.Mischanko at arcelormittal.com
Tue Jun 28 03:45:00 UTC 2011


Hello, Is anyone understanding what I am saying?????

Did you see the ntpq -p post that shows the server with high jitter and
high offset selected?

What I am saying is that the various algorithms don't neccisarily work
as described.
 
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Subject: Re: [ntp:questions] Selection and Clustering of candidates

Mischanko, Edward T wrote:
> 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.

Which would NTP choose?
You are likely taking less into consideration than NTP.

See:

How NTP Works
<http://www.eecis.udel.edu/~mills/ntp/html/warp.html>
Clock Filter Algorithm
<http://www.eecis.udel.edu/~mills/ntp/html/filter.html>
Clock Select Algorithm
<http://www.eecis.udel.edu/~mills/ntp/html/select.html>
Clock Cluster Algorithm
<http://www.eecis.udel.edu/~mills/ntp/html/cluster.html>

NTP Architecture, Protocol and Algorithms
<http://www.cis.udel.edu/~mills/database/brief/arch/arch.ppt>

Computer Network Time Synchronization
<http://www.eecis.udel.edu/~mills/book.html>

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