linux-kernel - Re: Xeon 5500 series support in kernel

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Message-ID: <87k52o65gk.fsf@hades.wkstn.nix>
Date:	Sat, 04 Jul 2009 12:41:15 +0100
From:	Nix <nix@...eri.org.uk>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	xb <xavier.bru@...l.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Xeon 5500 series support in kernel

On 2 Jul 2009, Andi Kleen outgrape:

> xb <xavier.bru@...l.net> writes:
>
>> I wonder if there are specific kernel configuration parameters that
>> allow to optimize performances on the recent Xeon 5500 processors (aka
>> Nehalem).
>
> The most important optimization is to use a 64bit kernel with NUMA
> support enabled (even if you use 32bit userland)

Surely NUMA only benefits you if you have a >1 socket system? Where's
the nonuniform access on a 1-socket machine? Every core is as far from
all the RAM as every other core, isn't it?
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