From owner-cvs-all  Sun May  9 21:52:54 1999
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Date: Mon, 10 May 1999 14:52:46 +1000
From: Bruce Evans <bde@zeta.org.au>
Message-Id: <199905100452.OAA04584@godzilla.zeta.org.au>
To: bde@zeta.org.au, nsayer@quack.kfu.com
Subject: Re: cvs commit: src/sys/kern kern_time.c
Cc: cvs-all@FreeBSD.org, cvs-committers@FreeBSD.org,
	nsayer@FreeBSD.org
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>> An application can only avoid these problems by being fairly aware of
>> the implementation and doing micro-adjustments, but micro-adjustments
>> can be done better using adjtime(2), modulo the reluctance of adjtime()
>> to adjust the time rapidly.
>
>Fine. Then YOU fix xntpd so that it doesn't do EXACTLY AS YOU DESCRIBE,
>in that when the adjustment is too large it switches to making smallish
>calls to settimeofday(). Then we can just plain outlaw settimeofday()
>when securelevel>0. In the mean time, the code in question makes

Use the standard xntpd options SLEWALWAYS and maybe FORCE_NTPDATE_STEP.

From xntpd/include/ntp_machine.h:

STEP SLEW OR TWO STEP - The Default is to step.

  SLEWALWAYS  	    - setttimeofday can not be used to set the time of day at
		      all.
  STEP_SLEW 	    - setttimeofday can not set the seconds part of time
		      time use setttimeofday to set the seconds part of the
		      time and the slew the seconds.
  FORCE_NTPDATE_STEP - even if SLEWALWAYS is defined, force a step of
		      of the systemtime (via settimeofday()). Only takes
		      affect if STEP_SLEW isn't defined.

Bruce


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