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Date: Wed, 21 Aug 2013 08:03:38 -0700
From: Peter Grehan <grehan@freebsd.org>
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To: Andre Oppermann <andre@freebsd.org>
Subject: Re: svn commit: r254520 - in head/sys: kern sys
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Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org,
 src-committers@freebsd.org, Navdeep Parhar <np@FreeBSD.org>
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> The way to go should be 4K clusters as they are native to the architecture.
> IIRC a PCIe DMA can't cross a 4K boundary anyway

  That's a 4G boundary, for some devices.

later,

Peter.