On Fri, 2011-08-26 at 19:26 +0800, Wu Fengguang wrote: > Now I get 3 figures. Test case is: run 1 dd write task for 300s, with > a "disturber" dd read task during roughly 120-130s. Ah, but ideally the disturber task should run in bursts of 100ms (<feedback period), otherwise your N is indeed mostly constant. -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href