Messages in this thread | | | From | Andi Kleen <> | Subject | Re: [PATCH 00/10] x86: Reduce memory and intra-node effects with large count NR_CPUs | Date | Mon, 14 Jan 2008 11:04:18 +0100 |
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> 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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