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Date:      Fri, 05 Mar 1999 20:53:06 +0100
From:      Poul-Henning Kamp <phk@freebsd.org>
To:        current@freebsd.org
Subject:   NTP nanokernel support (experimental)
Message-ID:  <8401.920663586@critter.freebsd.dk>

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	http://www.freebsd.org/~phk/x.nanokernel.gz

contains patches relative to -current to implement the new "nanokernel"
PLL from Dave Mills.

This only works with a ntpd v4, suggest 4.92c or better from:

	ftp://ftp.eecis.udel.edu/pub/ntp

It does still not support the hardpps()/PPS_SYNC support, that will
come later.

Make sure to configure/make your ntpd-4 from scratch to gain
advantage of the new resolution, simple recompilation may not be
enough.  (You also need to get timex.h from /sys/sys to /usr/include/sys.
Make world recommended).

You should now be truly limited to hardware performance (xtal tempco
and interrupt jitter).

Please send comments and observations, both positive AND negative.

I am very interested in seing some peerstats files for refclocks
running this code.

Poul-Henning

PS: See also http://www.freebsd.org/~phk/timechan.gif

--
Poul-Henning Kamp             FreeBSD coreteam member
phk@FreeBSD.ORG               "Real hackers run -current on their laptop."
FreeBSD -- It will take a long time before progress goes too far!


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