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From: Colin Percival <cperciva@FreeBSD.org>
Date: Mon, 22 Nov 2010 09:13:25 +0000 (UTC)
To: cvs-src-old@freebsd.org
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Subject: cvs commit: src/sys/kern kern_tc.c
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cperciva    2010-11-22 09:13:25 UTC

  FreeBSD src repository

  Modified files:
    sys/kern             kern_tc.c 
  Log:
  SVN rev 215665 on 2010-11-22 09:13:25Z by cperciva
  
  In tc_windup, handle the case where the previous call to tc_windup was
  more than 1s earlier.  Prior to this commit, the computation of
  th_scale * delta (which produces a 64-bit value equal to the time since
  the last tc_windup call in units of 2^(-64) seconds) would overflow and
  any complete seconds would be lost.
  
  We fix this by repeatedly converting tc_frequency units of timecounter
  to one seconds; this is not exactly correct, since it loses the NTP
  adjustment, but if we find ourselves going more than 1s at a time between
  clock interrupts, losing a few seconds worth of NTP adjustments is the
  least of our problems...
  
  Revision  Changes    Path
  1.195     +10 -0     src/sys/kern/kern_tc.c