Chris, Did you enable any NUMA policy? That could start swapping even if there are lots of free pages in some nodes. Are your free pages equally distributed over the nodes? Or limited to some of the nodes? Try this command: grep MemFree /sys/devices/system/node/node*/meminfo Thanks, Fengguang -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx"> email@xxxxxxxxx </a>