On Fri, 25 Jan 2013 17:54:53 -0800 (PST) Hugh Dickins <hughd@xxxxxxxxxx> 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. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>