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Date: Sat, 14 Mar 2015 14:18:54 +0200
From: Konstantin Belousov <kostikbel@gmail.com>
To: Steven Hartland <killing@multiplay.co.uk>
Subject: Re: Server with 3TB Crashing at boot
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Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>,
 Michael Fuckner <michael@fuckner.net>, Ryan Stone <rysto32@gmail.com>
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On Sat, Mar 14, 2015 at 12:04:28PM +0000, Steven Hartland wrote:
> On 14/03/2015 11:57, Konstantin Belousov wrote:
> > On Sat, Mar 14, 2015 at 11:43:49AM +0000, Steven Hartland wrote:
> >> Thats failing in bus_dmamem_alloc so as a guess I'd say there's no space
> >> below the 4GB boundary for the allocation of size qsize.
> > If this is indeed the case, laoder tunable hw.dmar.enable=1 could help.
> > I assume that machine of this class does have VT-d hardware, you might
> > need to enable it in BIOS.
> I don't see that sysctl on my 10.1 boxes, is that something only in 
> stable / current?

This is tunable, it should work in 10.1, but stable/10 and head has some
worthy fixes.