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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>
Cc:        "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>, Michael Fuckner <michael@fuckner.net>, Ryan Stone <rysto32@gmail.com>
Subject:   Re: Server with 3TB Crashing at boot
Message-ID:  <20150314121854.GH2379@kib.kiev.ua>
In-Reply-To: <550423CC.9080409@multiplay.co.uk>
References:  <CAJ-Vmom%2BZy_6ZCcTA_h4LFL-wDdaCmbqAgN5shpOsBBgWJw1mg@mail.gmail.com> <5503234A.4060103@fuckner.net> <55032C1B.5030004@multiplay.co.uk> <CAFMmRNzmr0Z1vXYK5y2QLk3eyUqXyK8TELgh4KHZ%2BDQVDXWZAg@mail.gmail.com> <275339388.395931.1426279324879.JavaMail.open-xchange@ptangptang.store> <CAFMmRNya8ZV=D3z0dE1%2BDsprAVBvcHZFGN1g1Ezd8k84nE3kVA@mail.gmail.com> <5503DC66.40409@fuckner.net> <55041EF5.9080200@multiplay.co.uk> <20150314115733.GG2379@kib.kiev.ua> <550423CC.9080409@multiplay.co.uk>

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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.



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