Btrfs: Improve metadata read latencies

[linux-2.6-omap-h63xx.git] / fs / btrfs / ctree.c

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index f82f8db02275912ec50dba3e18a31e698bed183a..ac61c50a331156d73d864a78067636b45817d500 100644 (file)
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -1285,16 +1285,16 @@ static noinline void reada_for_search(struct btrfs_root *root,
                }
                search = btrfs_node_blockptr(node, nr);
                if ((search >= lowest_read && search <= highest_read) ||
-                   (search < lowest_read && lowest_read - search <= 32768) ||
-                   (search > highest_read && search - highest_read <= 32768)) {
+                   (search < lowest_read && lowest_read - search <= 16384) ||
+                   (search > highest_read && search - highest_read <= 16384)) {
                        readahead_tree_block(root, search, blocksize,
                                     btrfs_node_ptr_generation(node, nr));
                        nread += blocksize;
                }
                nscan++;
-               if (path->reada < 2 && (nread > (256 * 1024) || nscan > 32))
+               if (path->reada < 2 && (nread > (64 * 1024) || nscan > 32))
                        break;
-               if(nread > (1024 * 1024) || nscan > 128)
+               if(nread > (256 * 1024) || nscan > 128)
                        break;
 
                if (search < lowest_read)