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Date: Tue, 4 Nov 2014 16:16:09 -0700 (MST)
From: Warren Block <wblock@wonkity.com>
To: Chris H <bsd-lists@bsdforge.com>
Subject: Re: Reducing the size of the ports tree (brainstorm v2)
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On Tue, 4 Nov 2014, Chris H wrote:

> gpart(8) -a gives you what you need. If it's truly as bad as all that,
> mounting the ports tree on a 512k aligned slice will reduce the "slack"
> you appear to be referring to. zfs(8) also has this ability.

Not alignment, but filesystem block size.  But that can only be set for 
an entire filesystem, and it's a tradeoff.