[ntp:questions] NTP 4.2.2p4 loopstats

mills at udel.edu mills at udel.edu
Mon Nov 13 17:08:04 UTC 2006


What changes are you talking about? The loopstats have not changed in 
many years. They include the time and datestamp, the magnitude and 
deviation of both the time and frequency offset and the time constant 
(poll interval). There is not much else that can be reported about the 
clock discipline algorithm. This is the same data reported over two 
decades of loopstats recording. Am I missing something?

The rv statistics have in fact changed in really minor ways; the clock 
discipline jitter has been separated from the selection jitter, but if 
this is important in your performance analysis, I would be truly surprised.


TomD wrote:

> re: "I believe Dave has good reasons for making these sort of changes"
>       Absolutely!    Me too!
> That's why I urged no other changes besides what goes into loopstats.
> Let's not overstate the problem.   A "few" people might need to adjust
> to the change in the data files.  In this case, a bit of an explanation
> in the release notes and docs might have been good enough.
> In hindsight: adding clock_jitter as an eighth field - leaving the
> other seven fields intact - might also have been a nice choice, but
> only because sys_jitter is still available.
> As it is, any folks who seriously post-process loopstats probably won't
> balk at a small code-change to buy them a little more time to adapt to
> the new stats.
> I'm not sure if you really want to get into data analysis on log files.
> That would likely be a messy business.  Everyone probably does it
> differently.  I'd hate to see any NTP development effort redirected
> towards data-analysis at the expense of time-keeping.
> Just my 2 cents worth...
> -tom-

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