Re: [PATCH 0/2] Disable zone_reclaim_mode by default

[Jeremy Harris]

On 08/04/14 23:58, Christoph Lameter wrote:
> The reason that zone reclaim is on by default is that off node accesses
> are a big performance hit on large scale NUMA systems (like ScaleMP and
> SGI). Zone reclaim was written *because* those system experienced severe
> performance degradation.
>
> On the tightly coupled 4 and 8 node systems there does not seem to
> be a benefit from what I hear.

In principle, is this difference in distance something the kernel
could measure?
--
Cheers,
   Jeremy


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