[ntp:questions] Tighter regulation?

Mischanko, Edward T Edward.Mischanko at arcelormittal.com
Tue May 21 12:24:37 UTC 2013


Below is my loopstats file:

56432 37096.090 0.000000000 0.854 0.000001907 0.000000 5
56432 37193.357 -0.000498569 0.854 0.000176280 0.000000 5
56432 37356.388 -0.000635872 0.459 0.000171892 0.139789 5
56432 37581.427 -0.000141746 0.337 0.000237431 0.137653 5
56432 37587.427 0.000378025 0.346 0.000288265 0.128799 5
56432 37648.439 0.000090557 0.367 0.000288166 0.120711 5
56432 37681.446 0.000138788 0.384 0.000270093 0.113084 5
56432 37878.483 0.000253057 0.574 0.000255859 0.125340 6
56432 37980.503 0.000310133 0.604 0.000240183 0.117729 6
56432 37981.503 0.000062108 0.605 0.000241178 0.110125 6
56432 38181.541 0.000267599 0.656 0.000237011 0.104581 6
56432 38288.562 0.000076744 0.663 0.000231745 0.097866 6
56432 38487.600 0.000248682 0.711 0.000225139 0.093054 6
56432 38622.626 0.000181529 0.734 0.000211933 0.087435 7
56432 38667.636 0.000235950 0.737 0.000199176 0.081793 7
56432 38922.683 0.000130787 0.744 0.000189986 0.076562 7
56432 39022.703 0.000062301 0.746 0.000179358 0.071619 7
56432 39055.709 0.000129679 0.747 0.000169457 0.066994 7
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56432 86372.766 0.000182964 1.038 0.000136773 0.002796 8

> -----Original Message-----
> From: questions-bounces+edward.mischanko=arcelormittal.com at lists.ntp.org
> [mailto:questions-
> bounces+edward.mischanko=arcelormittal.com at lists.ntp.org] On Behalf Of
> David Woolley
> Sent: Monday, May 20, 2013 8:13 AM
> To: questions at lists.ntp.org
> Subject: Re: [ntp:questions] Tighter regulation?
> 
> Mischanko, Edward T wrote:>
> > The particular client I am monitoring is on an extremely stable
> corporate
> > LAN.  The servers are on the same LAN.  Changes in network propagation
> > are minimal.
> 
> On the other hand, it is on Windows, which doesn't have very stable time
> measurement.
> 
> >
> > The 8 stage minimum delay filter is exactly what I am seeing and exactly
> > what I would like to disable.  When polling above 256 seconds the amount
> > of time it takes to make an adjustment is excessive.  Setting maxpoll to
> > 8 does help, but that defeats what server administrators like to have to
> > reduce loading, on a grand scheme.
> 
> Defeating this will not have a large effect if you really do have very
> consistent measurement errors, as the polling over samples compared with
> the needs of the loop filter.  If measurement errors are variable, it
> will degrade the performance.
> >
> > I am not sure what jitter will do, but what good is low jitter at the
> > expense of poor offset correction?
> >
> Increased jitter means that your offset measurements span a wider range
> of values.
> 
> I think you need to provide:
> 
> 1) a tabulation of the raw offset values, including signs;
> 2) an analysis of the breakdown of errors between the crystal frequency,
> Windows load related errors, and network load related error.
> 
> It is important to understand that offset is time error + measurement
> error, and in the steady state, measurement error will be the dominant
> component.
> 
> _______________________________________________
> questions mailing list
> questions at lists.ntp.org
> http://lists.ntp.org/listinfo/questions


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