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Date: Mon, 08 Oct 2001 15:37:27 -0400
From: Peter Rival <frival@zk3.dec.com>
Organization: Tru64 QMG Performance Engineering
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To: Jesse Barnes <jbarnes@sgi.com>
Cc: "Martin J. Bligh" <Martin.Bligh@us.ibm.com>, linux-kernel@vger.kernel.org
Subject: Re: Whining about NUMA. :)  [Was whining about 2.5...]
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Just to put in my $0.02 on this...  Compaq systems will span the range 
on this.  The current Wildfire^WGS Series systems have two levels - 
either "local" or "remote", which is just under 3:1 latency vs. local. 
This is all public knowledge, if you care to dig through all the docs. ;)

With the new EV7 systems coming out soon (next year?) every CPU has a 
switch and memory controller built in, so as you add CPUs (up to 64) you 
potentially add levels of latency.  I can't say what they are, but the 
numbers I've been given so far are _much_ better than that.  Just 
another data point. :)

  - Pete

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