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SubjectRe: [PATCH 1/11] ksm: allow trees per NUMA node
On Fri, 25 Jan 2013 17:54:53 -0800 (PST)
Hugh Dickins <hughd@google.com> wrote:

> --- mmotm.orig/Documentation/vm/ksm.txt 2013-01-25 14:36:31.724205455 -0800
> +++ mmotm/Documentation/vm/ksm.txt 2013-01-25 14:36:38.608205618 -0800
> @@ -58,6 +58,13 @@ sleep_millisecs - how many milliseconds
> e.g. "echo 20 > /sys/kernel/mm/ksm/sleep_millisecs"
> Default: 20 (chosen for demonstration purposes)
>
> +merge_across_nodes - specifies if pages from different numa nodes can be merged.
> + When set to 0, ksm merges only pages which physically
> + reside in the memory area of same NUMA node. It brings
> + lower latency to access to shared page. Value can be
> + changed only when there is no ksm shared pages in system.
> + Default: 1
> +

The explanation doesn't really tell the operator whether or not to set
merge_across_nodes for a particular machine/workload.

I guess most people will just shrug, turn the thing on and see if it
improved things, but that's rather random.



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