src/patches/suse-2.6.27.31/patches.suse/mm-increase-dirty-limits.patch

   1 From: Jan Kara <jack@suse.cz>
   2 Subject: Increase limits for starting writeback of dirty data
   3 References: bnc#449662
   4 Patch-mainline: ?
   5
   6 Return limits for dirty pages writeback to the numbers from SLES10. This dramatically
   7 improves performance of workloads dirtying a lot of memory (e.g. simple databases not
   8 using direct IO) and we're not aware it would harm anything.
   9
  10 Signed-off-by: Jan Kara <jack@suse.cz>
  11
  12 diff -rupX /home/jack/.kerndiffexclude linux-2.6.27/mm/page-writeback.c linux-2.6.27-dirty_limits//mm/page-writeback.c
  13 --- linux-2.6.27/mm/page-writeback.c    2008-10-10 00:13:53.000000000 +0200
  14 +++ linux-2.6.27-dirty_limits/mm/page-writeback.c       2009-01-07 16:09:24.000000000 +0100
  15 @@ -66,7 +66,7 @@ static inline long sync_writeback_pages(
  16  /*
  17   * Start background writeback (via pdflush) at this percentage
  18   */
  19 -int dirty_background_ratio = 5;
  20 +int dirty_background_ratio = 10;
  21
  22  /*
  23   * free highmem will not be subtracted from the total free memory
  24 @@ -77,7 +77,7 @@ int vm_highmem_is_dirtyable;
  25  /*
  26   * The generator of dirty data starts writeback at this percentage
  27   */
  28 -int vm_dirty_ratio = 10;
  29 +int vm_dirty_ratio = 40;
  30
  31  /*
  32   * The interval between `kupdate'-style writebacks, in jiffies