Re: [PATCH 1/3] Zone reclaim V3: main patch

[Andi Kleen]

> For Altix 20 means that the other node is remote but in the same 
> enclosure / motherboard. Latency is very low in these cases. I think in 
> these small configurations it is better to go off node rather than using 
> the reclaim logic.

On Opterons the NUMA factors are usually < 2, more towards 1, but people
definitely note a difference between node and off node.
So I don't think that's a good heuristic. 

I would use > LOCAL_DISTANCE or perhaps if you really want
a new constant with value 12-15. 

> RECLAIM_DISTANCE can be set per arch if the default is not okay.

Well if anything it would be per system - perhaps need to make
it a boot option or somesuch later. 

-Andi
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