Reduce the dampening for the control system, yielding faster convergence. The change is a bit conservative, as smaller values may lead to noticeable bdi threshold fluctuates in low memory JBOD setup. CC: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> CC: Richard Kennedy <richard@xxxxxxxxxxxxxxx> Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx> --- mm/page-writeback.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- linux-next.orig/mm/page-writeback.c 2011-03-02 14:52:19.000000000 +0800 +++ linux-next/mm/page-writeback.c 2011-03-02 15:00:17.000000000 +0800 @@ -145,7 +145,7 @@ static int calc_period_shift(void) else dirty_total = (vm_dirty_ratio * determine_dirtyable_memory()) / 100; - return 2 + ilog2(dirty_total - 1); + return ilog2(dirty_total - 1); } /* -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>