On Fri, Aug 26, 2011 at 08:11:50PM +0800, Peter Zijlstra wrote: > 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. Ah yeah, the disturber task should be a dd writer! Then we get - 120s: N=1 => N=2 - 130s: N=2 => N=1 I'll try it right away. Thanks, Fengguang -- 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=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>