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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