b=21137 ext4 extent allocation is slower than in ext3

[fs/lustre-release.git] / ldiskfs / kernel_patches / patches / ext4-prealloc-rhel5.patch

diff --git a/ldiskfs/kernel_patches/patches/ext4-prealloc-rhel5.patch b/ldiskfs/kernel_patches/patches/ext4-prealloc-rhel5.patch
index d09f8f5..d2272bb 100644 (file)
--- a/ldiskfs/kernel_patches/patches/ext4-prealloc-rhel5.patch
+++ b/ldiskfs/kernel_patches/patches/ext4-prealloc-rhel5.patch
@@ -58,7 +58,7 @@ Index: linux-2.6.18-128.1.6/fs/ext4/mballoc.c
  int ext4_mb_init(struct super_block *sb, int needs_recovery)
  {
        struct ext4_sb_info *sbi = EXT4_SB(sb);
-@@ -2542,13 +2562,55 @@
+@@ -2542,13 +2562,57 @@
        sbi->s_mb_max_to_scan = MB_DEFAULT_MAX_TO_SCAN;
        sbi->s_mb_min_to_scan = MB_DEFAULT_MIN_TO_SCAN;
        sbi->s_mb_stats = MB_DEFAULT_STATS;
@@ -68,7 +68,7 @@ Index: linux-2.6.18-128.1.6/fs/ext4/mballoc.c
 -      sbi->s_mb_group_prealloc = MB_DEFAULT_GROUP_PREALLOC;
 +
 +      if (sbi->s_stripe == 0) {
-+              sbi->s_mb_prealloc_table_size = 8;
++              sbi->s_mb_prealloc_table_size = 10;
 +              i = sbi->s_mb_prealloc_table_size * sizeof(unsigned long);
 +              sbi->s_mb_prealloc_table = kmalloc(i, GFP_NOFS);
 +              if (sbi->s_mb_prealloc_table == NULL) {
@@ -86,6 +86,8 @@ Index: linux-2.6.18-128.1.6/fs/ext4/mballoc.c
 +              ext4_mb_prealloc_table_add(sbi, 128);
 +              ext4_mb_prealloc_table_add(sbi, 256);
 +              ext4_mb_prealloc_table_add(sbi, 512);
++              ext4_mb_prealloc_table_add(sbi, 1024);
++              ext4_mb_prealloc_table_add(sbi, 2048);
 +
 +              sbi->s_mb_small_req = 256;
 +              sbi->s_mb_large_req = 1024;