1. 16 3月, 2006 1 次提交
    • P
      powerpc: Fix problem with time going backwards · 0a45d449
      Paul Mackerras 提交于
      The recent changes to keep gettimeofday in sync with xtime had the side
      effect that it was occasionally possible for the time reported by
      gettimeofday to go back by a microsecond.  There were two reasons:
      (1) when we recalculated the offsets used by gettimeofday every 2^31
      timebase ticks, we lost an accumulated fractional microsecond, and
      (2) because the update is done some time after the notional start of
      jiffy, if ntp is slowing the clock, it is possible to see time go backwards
      when the timebase factor gets reduced.
      
      This fixes it by (a) slowing the gettimeofday clock by about 1us in
      2^31 timebase ticks (a factor of less than 1 in 3.7 million), and (b)
      adjusting the timebase offsets in the rare case that the gettimeofday
      result could possibly go backwards (i.e. when ntp is slowing the clock
      and the timer interrupt is late).  In this case the adjustment will
      reduce to zero eventually because of (a).
      Signed-off-by: NPaul Mackerras <paulus@samba.org>
      0a45d449
  2. 14 3月, 2006 2 次提交
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