linux-kernel - Re: [PATCH 00/10] x86: Reduce memory and intra-node effects with large count NR

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Date:	Mon, 14 Jan 2008 11:04:18 +0100
From:	Andi Kleen <ak@...e.de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	travis@....com, Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <clameter@....com>,
	Jack Steiner <steiner@....com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/10] x86: Reduce memory and intra-node effects with large count NR_CPUs


> i.e. we've got ~22K bloat per CPU - which is not bad, but because it's a 
> static component, it hurts smaller boxes. For distributors to enable 
> CONFIG_NR_CPU=1024 by default i guess that bloat has to drop below 1-2K 
> per CPU :-/ [that would still mean 1-2MB total bloat but that's much 
> more acceptable than 23MB]

Even 1-2MB overhead would be too much for distributors I think. Ideally
there must be near zero overhead for possible CPUs (and I see no principle
reason why this is not possible) Worst case a low few hundred KBs, but even
that would be much.

There are the cpusets which get passed around, but these are only one bit per 
possible CPU.

-Andi
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