xfs: bump up nr_to_write in xfs_vm_writepage

VM calculation for nr_to_write seems off.  Bump it way
up, this gets simple streaming writes zippy again.
To be reviewed again after Jens' writeback changes.

Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Cc: Chris Mason <chris.mason@oracle.com>
Reviewed-by: Felix Blyakher <felixb@sgi.com>
Signed-off-by: Felix Blyakher <felixb@sgi.com>

diff --git a/fs/xfs/linux-2.6/xfs_aops.c b/fs/xfs/linux-2.6/xfs_aops.c
index 7ec89fc05b2b66d9ed5ca462d2d7f05d44c83dbc..aecf2519db76345a206fb812c61f0598d85440fb 100644 (file)
--- a/fs/xfs/linux-2.6/xfs_aops.c
+++ b/fs/xfs/linux-2.6/xfs_aops.c
@@ -1268,6 +1268,14 @@ xfs_vm_writepage(
        if (!page_has_buffers(page))
                create_empty_buffers(page, 1 << inode->i_blkbits, 0);
 
+
+       /*
+        *  VM calculation for nr_to_write seems off.  Bump it way
+        *  up, this gets simple streaming writes zippy again.
+        *  To be reviewed again after Jens' writeback changes.
+        */
+       wbc->nr_to_write *= 4;
+
        /*
         * Convert delayed allocate, unwritten or unmapped space
         * to real space and flush out to disk.