ext3 sequential read regression fix

ext3-get-blocks support caused ~20% degrade in Sequential read
performance (tiobench). Problem is with marking the buffer boundary
so IO can be submitted right away. Here is the patch to fix it.

2.6.18-rc6:

diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
index 21b8bf4ee8613e0a58b1cd87b3fff6e549a9dda7..f9be16e3393eefdf500468157e34ffbb9a0ac42a 100644 (file)
--- a/fs/ext3/inode.c
+++ b/fs/ext3/inode.c
@@ -926,7 +926,7 @@ int ext3_get_blocks_handle(handle_t *handle, struct inode *inode,
        set_buffer_new(bh_result);
 got_it:
        map_bh(bh_result, inode->i_sb, le32_to_cpu(chain[depth-1].key));
-       if (blocks_to_boundary == 0)
+       if (count > blocks_to_boundary)
                set_buffer_boundary(bh_result);
        err = count;
        /* Clean up and exit */