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Date:      Mon, 7 Feb 2005 11:17:34 -0600 (CST)
From:      Chris Dillon <cdillon@wolves.k12.mo.us>
To:        Scott Long <scottl@freebsd.org>
Cc:        Nathan Vidican <nvidican@wmptl.com>
Subject:   Re: Intel EMT64 Xeon vs AMD Opteron
Message-ID:  <20050207111200.G36249@duey.wolves.k12.mo.us>
In-Reply-To: <42044B92.4040102@freebsd.org>
References:  <000001c50a3c$50f2eba0$6800000a@r3140ca> <20050204103708.21608.qmail@web26801.mail.ukl.yahoo.com> <2fd864e05020419434705bf70@mail.gmail.com> <42044B92.4040102@freebsd.org>

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On Fri, 4 Feb 2005, Scott Long wrote:

> With FreeBSD, it's a bit of a toss-up.  There is no strong affinity 
> set or enforced between process memory and where the process is 
> running. Having some notion of affinity (i.e. NUMA support) would be 
> a good thing.  Oh, and the 4+2 configurations are typically pretty 
> poor, regardless.

For non-NUMA-aware operating systems, you should turn on Node 
Interleaving for the memory system which will spread the memory 
accesses across all processors.  Hopefully all multi-processor Opteron 
system BIOSes will give you this option, my Tyan S2885 does.

-- 
  Chris Dillon - cdillon(at)wolves.k12.mo.us
  FreeBSD: The fastest, most open, and most stable OS on the planet
  - Available for IA32, IA64, AMD64, PC98, Alpha, and UltraSPARC architectures
  - PowerPC, ARM, MIPS, and S/390 under development
  - http://www.freebsd.org

Q: Because it reverses the logical flow of conversation.
A: Why is putting a reply at the top of the message frowned upon?



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