[ntp:questions] drift modeling question

Hal Murray hal-usenet at ip-64-139-1-69.sjc.megapath.net
Fri Jul 11 17:29:53 UTC 2008


In article <tYudnaaRSP7_C-rVnZ2dnUVZ_hqdnZ2d at nethere.com>,
 shy author <shy.author.not at aol.com> writes:
>Has anyone thought about removing both the linear terms and quadratic 
>terms in the drift, by utilizing the temperature sensor readings 
>available on many of the latest motherboards?

Linear works pretty well.  I think it would be hard to get quadratic.

  NTP temperature compensation
  Mark Martinec, 2001-01-08
  http://www.ijs.si/time/temp-compensation/


>Just a thought, but it seems a shame that we're not taking advantage of 
>the thermal data available to us, when correcting for clock drift and 
>simply using a linear correction.

The temperature sensor is probably in the CPU chip.  You probably
want it on the crystal.  The sensors on CPUs tend to be coarse.

-- 
These are my opinions, not necessarily my employer's.  I hate spam.




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