From owner-freebsd-current@FreeBSD.ORG  Sat Apr 14 02:53:22 2007
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Date: Thu, 12 Apr 2007 21:58:45 +1000
From: Antony Mawer <fbsd-fs@mawer.org>
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Cc: freebsd-fs@freebsd.org, Peter Jeremy <peterjeremy@optushome.com.au>,
	freebsd-current@freebsd.org,
	Pawel Jakub Dawidek <pjd@freebsd.org>, ticso@cicely.de
Subject: Re: ZFS committed to the FreeBSD base.
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Dag-Erling Smørgrav wrote:
> Peter Jeremy <peterjeremy@optushome.com.au> writes:
>> There's a feature bit (CPUID_CX8) that advertises the availability of
>> cmpxchg8b (and maybe some related instructions).  My pre-MMX 586 has
>> this bit set so I presume anything later than 486 will support it.
>> (I'm not sure about the low-end VIA, GEODE etc clones).
> 
> The Geode is a 486, and does not support it.
> 
> The C3 however is a 586.  The C3 Ezra and C3 Samuel / Samuel 2 do not
> have CX8.  I'm not sure about the C3 Nehemiah, I don't have one
> running at the moment.

The Nehemiah doesn't look like it has CX8.. from one of my systems 
running a PD10000 board:

CPU: VIA C3 Nehemiah+RNG+ACE (1002.28-MHz 686-class CPU)
Origin = "CentaurHauls"  Id = 0x698  Stepping = 8
Features=0x381b83f<FPU,VME,DE,PSE,TSC,MSR,SEP,MTRR,PGE,CMOV,PAT,MMX,FXSR,SSE>

--Antony