Messages in this thread Patch in this message | | | Date | Thu, 03 Mar 2011 14:45:09 +0800 | From | Wu Fengguang <> | Subject | [PATCH 04/27] writeback: reduce per-bdi dirty threshold ramp up time |
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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@chello.nl> CC: Richard Kennedy <richard@rsk.demon.co.uk> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> --- 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); } /*
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