[aklug] Re: ntp and freebsd?

From: Leif Sawyer <lsawyer@gci.com>
Date: Fri Mar 16 2012 - 15:45:41 AKDT

GCI has stratum one time here in Anchorage and down in Seattle.

ntp.gci.net slaves off of it, so it's stratum-2 which is fine
for nearly everybuggy.=20

> -----Original Message-----
> From: aklug-bounce@aklug.org [mailto:aklug-bounce@aklug.org]=20
> On Behalf Of Shane Spencer
> Sent: Friday, March 16, 2012 3:17 PM
> Cc: aklug@aklug.org
> Subject: [aklug] Re: ntp and freebsd?
>=20
> On Thu, Mar 15, 2012 at 6:49 PM, Royce Williams=20
> <royce@tycho.org> wrote:
> > Dr. Anderson's claim is built on the idea that the FreeBSD kernel
> > supports nanosecond time precision. =3DA0I do not know enough=20
> about it to
> > verify whether or not Linux is truly lacking in=20
> nanosecond-level timing
> > for this purpose. =3DA0I found multiple people saying that=20
> online, but no
> > authoritative source.
> >
> > With Stratum 1, you're building an NTP server directly attached to a
> > high-precision time source, for which millisecond precision isn't
> > precise enough, so just running an NTP daemon isn't=20
> sufficient for what
> > he's trying to do.
> >
> > Part of the reason that FreeBSD is so well-equipped for=20
> high-precision
> > time is because a famous FreeBSD guy, Poul-Henning Kamp, is=20
> a huge time
> > geek, and he did a bunch of work to make FreeBSD=20
> recision-time-friendly.
> > He notices when *GPS satellites* have time that's off by less than a
> > millisecond.
> >
> > http://people.freebsd.org/~phk/
> >
> > Royce
> >
>=20
> I don't think I've ever seen a Stratum 1 box in my life...
>=20
> I've always used the ntp.org server (ntp in debian) along with a GPS
> for systems that couldn't retrieve time reliably in other ways. I
> really like this approach.. I typically use said systems to serve out
> a local broadcast time as well.
>=20
> I can't even imagine what hardware it would take to get nanosecond
> precision from Boulder, CO.
>=20
> - Shane
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>=20
> =
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Received on Fri Mar 16 15:46:14 2012

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