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From: Jung-uk Kim <jkim@FreeBSD.org>
Date: Thu, 12 Aug 2010 17:17:05 +0000 (UTC)
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Subject: cvs commit: src/sys/kern subr_rtc.c
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jkim        2010-08-12 17:17:05 UTC

  FreeBSD src repository

  Modified files:
    sys/kern             subr_rtc.c 
  Log:
  SVN rev 211230 on 2010-08-12 17:17:05Z by jkim
  
  Add the half of time-of-day clock resolution when we adjust system time from
  time-of-day clock or vice versa.  For x86 systems, RTC resolution is one
  second and we used to lose up to one second whenever we initialize system
  time from RTC or write system time back to RTC.  With this change, margin
  of error per conversion is roughly between -0.5 and +0.5 second rather
  than between -1 and 0 second.  Note that it does not take care of errors
  from getnanotime(9) (which is up to 1/hz second) or CLOCK_GETTIME() latency.
  These are just too expensive to correct and it is not worthy of the cost.
  
  Revision  Changes    Path
  1.14      +7 -1      src/sys/kern/subr_rtc.c