nanosleep returning early

[Brian Fundakowski Feldman]

On Wed, Jul 21, 2004 at 06:13:10PM +1000, John Birrell wrote:
> 
> Today I increased HZ in a current kernel to 1000 when adding dummynet.
> Now I find that nanosleep regularly comes back a little early.
> Can anyone explain why?
> 
> I would have expected that the *overrun* beyond the required time to vary,
> but never that it would come back early.

Is this a difference from clock_gettime(CLOCK_MONOTONIC)?  You really
shouldn't be using gettimeofday() foor internal timing since the
system clock can be adjusted by NTP.

-- 
Brian Fundakowski Feldman                           \'[ FreeBSD ]''''''''''\
  <> green at FreeBSD.org                               \  The Power to Serve! \
 Opinions expressed are my own.                       \,,,,,,,,,,,,,,,,,,,,,,\