- don't pass "prefer mergability over length" hint to mballoc

diff --git a/lustre/lvfs/fsfilt_ext3.c b/lustre/lvfs/fsfilt_ext3.c
index 58ed700..bd72e0f 100644 (file)
--- a/lustre/lvfs/fsfilt_ext3.c
+++ b/lustre/lvfs/fsfilt_ext3.c
@@ -762,8 +762,16 @@ static int ext3_ext_find_goal(struct inode *inode, struct ext3_ext_path *path,
                                                                                                                                                                                                      
                 /* try to predict block placement */
                 if ((ex = path[depth].p_ext)) {
+#if 0
+                        /* This prefers to eat into a contiguous extent
+                         * rather than find an extent that the whole
+                         * request will fit into.  This can fragment data
+                         * block allocation and prevents our lovely 1M I/Os
+                         * from reaching the disk intact. */
+
                         if (ex->ee_block + ex->ee_len == block)
                                 *aflags |= 1;
+#endif
                         return ex->ee_start + (block - ex->ee_block);
                 }