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Date: Wed, 20 Apr 2016 13:25:05 +0200
From: Miroslav Lachman <000.fbsd@quip.cz>
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To: Matthew Seaman <matthew@FreeBSD.org>, freebsd-current@freebsd.org
Subject: Re: [CFT] packaging the base system with pkg(8)
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Matthew Seaman wrote on 04/20/2016 12:43:

> On the release of 11.1 there would be a complete new set of system
> packages generated, and the upgrade process would install the new
> versions of those packages all round, even if the content of an
> individual package was identical to the one in 11.0.  There's probably a
> handy optimization where we compare the before and after checksums for
> package files and don't overwrite on disk what is identical between
> package versions, but do update all of the bookkeeping in the pkgdb.

This will be a really nice feature which can save a lot of bandwidth and 
storage for backups after upgrade. (but I don't know how many files are 
usually unchanged between upgrades)

Miroslav Lachman