[112785] in North American Network Operators' Group
RE: Leap second tonight
daemon@ATHENA.MIT.EDU (Tero Toikkanen)
Wed Mar 18 04:11:35 2009
From: Tero Toikkanen <Tero.Toikkanen@nebula.fi>
To: NANOG list <nanog@nanog.org>
Date: Wed, 18 Mar 2009 10:11:22 +0200
In-Reply-To: <D338D1613B32624285BB321A5CF3DB250CB140BF45@ginga.ai.net>
Errors-To: nanog-bounces@nanog.org
> Not being a time geek, since Cisco's were called out for being wild
> jitter-mongers... how much jitter are we talking about?
>=20
> Clock is synchronized, stratum 2, xxxxxxxxxxxxxxxxxxxxxxxx
> nominal freq is 250.0000 Hz, actual freq is 249.9989 Hz, precision is 2**=
18
> reference time is CD6A7CD4.45A9BB00 (19:47:32.272 UTC Tue Mar 17 2009)
> clock offset is 2.0581 msec, root delay is 29.62 msec
> root dispersion is 6.81 msec, peer dispersion is 3.30 msec
>=20
> Are we talking about +/- 30 seconds, or a problem bounded by +/- 30 msec?
I've actually been gathering some statistics on this using Munin (http://mu=
nin.projects.linpro.no/) on my linux server. There's currently 10 ntp serve=
rs being monitored and one of them is a 7600-series Cisco, which is handlin=
g quite a bit of traffic (CPU load around 20%). Here are the Munin graphs f=
or it http://dx.fi/alt/ntp/7600.png (times in Finnish time, UTC+2).
In comparison, here are the same graphs for time1.mikes.fi (a stratum-2 clo=
ck provided by the Finnish Centre for metrology and accreditation) http://d=
x.fi/alt/ntp/time1.mikes.fi.png and for Netnods stratum-1 clock in Stockhol=
m http://dx.fi/alt/ntp/ntp1.sth.netnod.se.png
Best regards,
--
Tero Toikkanen
Nebula Oy
