linux-kernel - Re: Bug: Status/Summary of slashdot leap-second crash on new years 2008-2009

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Message-ID: <496150DF.2070501@davidnewall.com>
Date:	Mon, 05 Jan 2009 10:44:23 +1030
From:	David Newall <davidn@...idnewall.com>
To:	david@...g.hm
CC:	Kyle Moffett <kyle@...fetthome.net>,
	Ben Goodger <goodgerster@...il.com>,
	Robert Hancock <hancockr@...w.ca>,
	linux-kernel@...r.kernel.org, linasvepstas@...il.com,
	"Jeffrey J. Kosowsky" <jeff@...owsky.org>,
	MentalMooMan <slashdot@...eshallam.info>,
	Travis Crump <pretzalz@...hhouse.org>, burdell@...ntheinter.net
Subject: Re: Bug: Status/Summary of slashdot leap-second crash on new years
 2008-2009

david@...g.hm wrote:
> On Mon, 5 Jan 2009, David Newall wrote:
>
>> david@...g.hm wrote:
>>> then new zoneinfo files need to be sent out every time there is a leap
>>> second (which from other posts on this thread is potentially every
>>> month)
>>
>> Not every few months, for goodness sake!  Leap seconds aren't that
>> common!  These files do change regularly, however, sometimes on a yearly
>> basis, because that's how often the date might be changed when daylight
>> savings transitions.  This is to say that leap seconds don't
>> particularly change the frequency of zoneinfo updates.
>
> another poster said that NTP packets include information about this
> month's leap second, so that implies that they could change monthly.

Not "could change monthly" rather, "could change at any month".

The frequency of zoneinfo updates would therefore be: every time the
zones you care about change; and every time there's a leap second.  No
big effort.
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