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Date: Wed, 4 Nov 2009 06:58:12 +0100
From: Ed Schouten <ed@80386.nl>
To: Attilio Rao <attilio@FreeBSD.org>
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Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org,
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Subject: Re: svn commit: r198868 - in head/sys: amd64/amd64 i386/i386
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Hi Attilio,

* Attilio Rao <attilio@FreeBSD.org> wrote:
> Opteron rev E family of processor expose a bug where, in very rare
> ocassions, memory barriers semantic is not honoured by the hardware
> itself. As a result, some random breakage can happen in uninvestigable
> ways (for further explanation see at the content of the commit itself).

Ooh. Sounds like an interesting bug.

The bug doesn't manifest itself on UP, right? If so, maybe we should add
some very short instructions to the warning on how to disable SMP.

--=20
 Ed Schouten <ed@80386.nl>
 WWW: http://80386.nl/

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