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Re: hard crash on leap second

On Thu, Jan 01, 2009 at 07:44:07 -0600, John Hasler (jhasler@debian.org) wrote: 

> I wrote:
> > Debian has time servers:
> > 
> > 0.debian.pool.ntp.org
> > 1.debian.pool.ntp.org
> > 2.debian.pool.ntp.org
> > 3.debian.pool.ntp.org
> Bob Cox writes:
> > These are all aliases for 0.pool.ntp.org, 1.pool.ntp.org and so on.
> That is how Debian and ntp.org have set it up.  It could change.  See
> <http://www.pool.ntp.org/vendors.html>.

Thank you John.  That's interesting.

> > It's probably best to use servers as close to you as possible...
> Unless you have unusual requirements (you'll know) it really doesn't
> matter.  It's just a few UDP packets per hour and just about any server
> anywhere in the world will get you within 100ms.
> > John - in your case it looks like your ISP is CenturyTel and they appear
> > to have a timeserver running on ntp0.centurytel.net...
> I prefer to use reliable sources.  Also, as Chrony maintainer I feel that I
> should use my default configuration as much as possible.
> > It seems that ntp4.ja.net is preferred to ntp0.zen.co.uk despite the
> > longer delay, presumably because it's a stratum 1 server?
> Look at the jitter.  The algorithm considers more than just the stratum and
> the round-trip delay.

Yes, that makes sense.  Thanks again.

Bob Cox.  Stoke Gifford, near Bristol, UK.
Please reply to the list only.  Do NOT send copies directly to me.
Debian on the NSLU2: http://bobcox.com/slug/

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