Re: [PATCH 1/5] cpuset memory spread basic implementation

[Christoph Lameter]

On Mon, 6 Feb 2006, Andi Kleen wrote:

> I still don't quite agree. As long as the latency penalty of going
> off node is not too bad (let's say < factor 2) i think it's better
> to spread out the caches than to always locate them locally.

AFAIK you can reach these low latency factors only if multiple nodes are 
on the same motherboard. Likely Opteron specific?

> If you have a much worse worst case NUMA factor it might be different,
> but even there it would be a good idea to at least spread it out
> to nearby nodes.

I dont understand you here. What would be the benefit of selecting more 
distant memory over local? I can only imagine that this would be 
beneficial if we know that the data would be used later by other 
processes.
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