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

[Andi Kleen]

> 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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