Re: [resend][PATCH] mm: increase RECLAIM_DISTANCE to 30

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On Fri, 8 Oct 2010, Balbir Singh wrote:

> I am not sure if this makes sense, since RECLAIM_DISTANCE is supposed
> to be a hardware parameter. Could you please help clarify what the
> access latency of a node with RECLAIM_DISTANCE 20 to that of a node
> with RECLAIM_DISTANCE 30 is? Has the hardware definition of reclaim
> distance changed?

10 is the local distance. So 30 should be 3x the latency that a local
access takes.

> I suspect the side effect is the zone_reclaim_mode is not set to 1 on
> bootup for the 2-4 socket machines you mention, which results in
> better VM behaviour?

Right.

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