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To: phk@phk.freebsd.dk
From: "M. Warner Losh" <imp@bsdimp.com>
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Cc: freebsd-arch@freebsd.org
Subject: Re: a proposed callout API 
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Here's a decoder ring...

In message: <6194.1164756521@critter.freebsd.dk>
            "Poul-Henning Kamp" <phk@phk.freebsd.dk> writes:
: given wall-clock (UTC) time.

UTC has leapseconds, and likely is adjusted by ntp.

: Others want to sleep on the absolute (TAI) timescale, such as TCP

TAI has no leapseconds and is a perfect monotonic timescale.

Warner