head	1.1;
access;
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locks; strict;
comment	@# @;


1.1
date	2008.08.22.15.58.00;	author roberto;	state Exp;
branches
	1.1.2.1
	1.1.4.1
	1.1.22.1;
next	;

1.1.2.1
date	2008.09.03.08.49.07;	author roberto;	state Exp;
branches;
next	;

1.1.4.1
date	2008.09.04.12.49.54;	author roberto;	state Exp;
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1.1.22.1
date	2008.08.22.15.58.00;	author svnexp;	state dead;
branches;
next	1.1.22.2;

1.1.22.2
date	2013.03.28.13.01.45;	author svnexp;	state Exp;
branches;
next	;


desc
@@


1.1
log
@SVN rev 182007 on 2008-08-22 15:58:00Z by roberto

Merge ntpd & friends 4.2.4p5 from vendor/ntp/dist into head.  Next commit
will update usr.sbin/ntp to match this.

MFC after:	2 weeks
@
text
@HP e3000 MPE/iX NTP Hints - May 29, 2001
----------------------------------------

NTP was first ported to MPE several years ago, but those diffs were never
submitted back to the official NTP distribution.  For more information about
that deprecated port, please see http://www.bixby.org/mark/xntpix.html.

NTP was re-ported to MPE in May 2001.  What follows are hints learned from
working with NTP 4.0.99k23.  For additional information about NTP on MPE,
please see http://jazz.external.hp.com/src/hp_freeware/ntp/.

MPE lacks the clock-related APIs expected by NTP, so adjtime(), gettimeofday(),
and settimeofday() all had to be implemented from scratch by calling
privileged, undocumented internal OS functions.

Unfortunately the implementation of adjtime() has exposed a sub-second accuracy
bug when slewing the system time.  This bug is documented in SR 5003462838, and
exists on all current versions of MPE.  It has not been fixed at the time of
this writing.  The adjtime() code may possibly need to be altered if/when this
bug is fixed.

This bug has a side-effect whereby the ntpd daemon will screw up the hardware
PDC clock time by many minutes if used for continuous clock adjustments or in
the one-time -q mode.  But note that you can safely run ntpd in order to become
a time server if you include "disable ntp" in the ntp.conf configuration file.

The one-time clock adjustment functionality of ntpdate and ntp_timeset is not
affected by this bug side-effect.  You can safely use these commands to alter
your system time with reasonable accuracy.

The only reference clock that has been tested on MPE is the local clock.  So
building NTP with --disable-all-clocks --enable-LOCAL_CLOCK is strongly
recommended.

NTP makes use of Privileged Mode (PM) capability in order to bind to the NTP
network port (123) and to access the low-level clock functions.

NTP was ported using the gcc compiler.  Attempting to use the HP C/iX compiler
is not recommended and has not been tested.

Please note that NTP is not an HP product and is NOT supported by HP.  The best
place for asking MPE-specific questions about NTP is the HP3000-L mailing list
at http://raven.utc.edu/Archives/hp3000-l.html or the associated Usenet
newsgroup of comp.sys.hp.mpe.

The original author of this port is:

Mark Bixby
HP CSY MPE Internet & Interoperability Engineer
mark_bixby@@hp.com
@


1.1.22.1
log
@file mpeix was added on branch RELENG_8_4 on 2013-03-28 13:01:45 +0000
@
text
@d1 50
@


1.1.22.2
log
@## SVN ## Exported commit - http://svnweb.freebsd.org/changeset/base/248810
## SVN ## CVS IS DEPRECATED: http://wiki.freebsd.org/CvsIsDeprecated
@
text
@a0 50
HP e3000 MPE/iX NTP Hints - May 29, 2001
----------------------------------------

NTP was first ported to MPE several years ago, but those diffs were never
submitted back to the official NTP distribution.  For more information about
that deprecated port, please see http://www.bixby.org/mark/xntpix.html.

NTP was re-ported to MPE in May 2001.  What follows are hints learned from
working with NTP 4.0.99k23.  For additional information about NTP on MPE,
please see http://jazz.external.hp.com/src/hp_freeware/ntp/.

MPE lacks the clock-related APIs expected by NTP, so adjtime(), gettimeofday(),
and settimeofday() all had to be implemented from scratch by calling
privileged, undocumented internal OS functions.

Unfortunately the implementation of adjtime() has exposed a sub-second accuracy
bug when slewing the system time.  This bug is documented in SR 5003462838, and
exists on all current versions of MPE.  It has not been fixed at the time of
this writing.  The adjtime() code may possibly need to be altered if/when this
bug is fixed.

This bug has a side-effect whereby the ntpd daemon will screw up the hardware
PDC clock time by many minutes if used for continuous clock adjustments or in
the one-time -q mode.  But note that you can safely run ntpd in order to become
a time server if you include "disable ntp" in the ntp.conf configuration file.

The one-time clock adjustment functionality of ntpdate and ntp_timeset is not
affected by this bug side-effect.  You can safely use these commands to alter
your system time with reasonable accuracy.

The only reference clock that has been tested on MPE is the local clock.  So
building NTP with --disable-all-clocks --enable-LOCAL_CLOCK is strongly
recommended.

NTP makes use of Privileged Mode (PM) capability in order to bind to the NTP
network port (123) and to access the low-level clock functions.

NTP was ported using the gcc compiler.  Attempting to use the HP C/iX compiler
is not recommended and has not been tested.

Please note that NTP is not an HP product and is NOT supported by HP.  The best
place for asking MPE-specific questions about NTP is the HP3000-L mailing list
at http://raven.utc.edu/Archives/hp3000-l.html or the associated Usenet
newsgroup of comp.sys.hp.mpe.

The original author of this port is:

Mark Bixby
HP CSY MPE Internet & Interoperability Engineer
mark_bixby@@hp.com
@


1.1.4.1
log
@SVN rev 182752 on 2008-09-04 12:49:54Z by roberto

MFH ntpd 4.2.4p5.

Main difference with the stable/7 merge is that 6.x does not support -lrt and
the corresponding *timer functions.

Approved by:	re (kensmith)
@
text
@@


1.1.2.1
log
@SVN rev 182716 on 2008-09-03 08:49:07Z by roberto

MFH ntpd 4.2.4p5.

Approved by:	re (kensmith)
@
text
@@

