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Date:      Sat, 21 Jul 2001 00:07:59 -0700 (PDT)
From:      Tom <tom@uniserve.com>
To:        Juha Saarinen <juha@saarinen.org>
Cc:        'Chan Tur Wei' <twchan@singnet.com.sg>, freebsd-stable@freebsd.org
Subject:   RE: FreeBSD 4.3 and 6G RAM
Message-ID:  <Pine.BSF.4.10.10107210005280.4917-100000@athena.uniserve.ca>
In-Reply-To: <000901c111a2$f581e770$0a01a8c0@den2>

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On Sat, 21 Jul 2001, Juha Saarinen wrote:

> :: Heh heh. Just a wild idea: How about a multi-processor 
> :: system FreeBSD where
> :: each CPU gets mapped to different 4G segments?  Perhaps some of the
> :: address space can overlap to offer real SMP?
> 
> Talking out of my hat here, but I don't think that's possible unless you
> run a separate kernel on each CPU...?
> 
> -- Juha

  Not really.  The non-uniform-memory-access (NUMA) model used by SGI and
IBM (Sequent) systems is pretty scalable.  Each processor has dedicated
fast memory, but can access other processor's memory space.  SNP systems
have a memory access bottleneck, that NUMA systems do not have, assuming
your load can be balanced.

Tom


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