DragonFly BSD
DragonFly commits List (threaded) for 2005-04
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cvs commit: src/usr.sbin/dntpd client.c client.h convert.c defs.h ntpreq.c

From: Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxxxxx>
Date: Sun, 24 Apr 2005 02:39:27 -0700 (PDT)

dillon      2005/04/24 02:39:27 PDT

DragonFly src repository

  Modified files:
    usr.sbin/dntpd       client.c client.h convert.c defs.h 
  Change client_check() to calculate the best offset and the best frequency
  correction separately.
  The best offset correction now utilizes a standard deviation of the offset
  error with a minimum of 4 samples.  An offset correction occurs when the
  standard deviation is less then 1/4 the average offset.  When an offset
  correction is made, the offset data is cleared (since it becomes invalid
  once a correction is made).  This calculation gives the code an almost
  human perception of when the offset can be safely adjusted, regardless
  of the 'mess' on the internet.
  Change tv_delta_micro() into tv_delta_double() since most of the callers
  were (previously) dividing the result by 1E6.
  NOTE: the correllation for frequency correction is not working quite as
  well as I had hoped, it's bouncing around a lot for internet ntp sources.
  But the standard deviation on the offset appears to work very well.
  Revision  Changes    Path
  1.4       +147 -23   src/usr.sbin/dntpd/client.c
  1.3       +22 -7     src/usr.sbin/dntpd/client.h
  1.3       +3 -3      src/usr.sbin/dntpd/convert.c
  1.3       +1 -1      src/usr.sbin/dntpd/defs.h
  1.3       +1 -1      src/usr.sbin/dntpd/ntpreq.c


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