Date: Wed, 21 Jul 2004 06:26:20 -0400 From: Brian Fundakowski Feldman <green@freebsd.org> To: John Birrell <jb@cimlogic.com.au> Cc: current@freebsd.org Subject: Re: nanosleep returning early Message-ID: <20040721102620.GF1009@green.homeunix.org> In-Reply-To: <20040721081310.GJ22160@freebsd3.cimlogic.com.au> References: <20040721081310.GJ22160@freebsd3.cimlogic.com.au>
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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@FreeBSD.org \ The Power to Serve! \ Opinions expressed are my own. \,,,,,,,,,,,,,,,,,,,,,,\
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