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Re: Predictable Internet Time

Toerless Eckert <tte@cs.fau.de> Tue, 18 April 2017 23:21 UTC

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Date: Wed, 19 Apr 2017 01:21:26 +0200
From: Toerless Eckert <tte@cs.fau.de>
To: Nico Williams <nico@cryptonector.com>
Cc: Phillip Hallam-Baker <phill@hallambaker.com>, Paul Eggert <eggert@cs.ucla.edu>, IETF Discussion Mailing List <ietf@ietf.org>, Patrik F?ltstr?m <paf@frobbit.se>
Subject: Re: Predictable Internet Time
Message-ID: <20170418232126.GD5937@faui40p.informatik.uni-erlangen.de>
References: <504e2cea0d1668c31486b05fec0a967a4446aefe@webmail.weijax.net> <CAMm+Lwi_jU6gjdtdM6a2n_9_89tUvWBNXxnMtSjTEA++h1D4Ew@mail.gmail.com> <e0a43370-751f-808c-3719-9716f9cd57d1@isi.edu> <B990A5A4-D62B-4E10-9FF7-7BA4377C0958@frobbit.se> <7bc1a350-549c-c649-81c6-bcd19cff36d7@cisco.com> <B2E6846E-F25B-4792-8E13-B5D898B67223@frobbit.se> <9f719b6a-f3c0-ef98-1636-86e84106e366@cisco.com> <16db07fe-acc5-d178-b56c-755c3cf70680@cs.ucla.edu> <CAMm+LwjQ_kaSBzcJhem5CbPLvMCAJRFnRpqJgu8SFTTQpt4bzQ@mail.gmail.com> <20170418222004.GB2856@localhost>
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Nice!

Why not start to tackle the problem pragmatically before asking for standards
when its clearly a political issue.

a) RFC describing the problems developers and system deployments can face
  because of leap seconds.
b) And best current practices to get around those issues. Eg: Expect clock
  smear on Jan 1 == reduced accuracy of ~1. Unless OS or other trusted
  info source gives explicit indication: NO leap, no smear.
c) And finally a description of the worst open issues when b) is applied.
   Anything worse than labels on products "reduced functionality on Jan 1
   after a leap second" ?

Cheers
    Toerless

On Tue, Apr 18, 2017 at 05:20:06PM -0500, Nico Williams wrote:
> On Tue, Jan 03, 2017 at 05:34:11PM -0500, Phillip Hallam-Baker wrote:
> > As I said, I want 30-100 years lead time so I can bake the schedule into
> > devices and remove a trust dependency.
> 
> 30 years' lead time for leap seconds?  Can't be done.
> 
> Leap seconds depend on events such as earthquakes.
> 
> You can estimate their frequency, but you can't estimate when they'll be
> inserted.
> 
> Nico
> -- 

-- 
---
tte@cs.fau.de

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