Btrfs: Optimize btree walking while logging inodes

Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index ecb74b7..7c06eb4 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1497,7 +1497,7 @@
 	 * low idle thresh
 	 */
 	fs_info->endio_workers.idle_thresh = 4;
-	fs_info->endio_write_workers.idle_thresh = 4;
+	fs_info->endio_write_workers.idle_thresh = 64;
 
 	btrfs_start_workers(&fs_info->workers, 1);
 	btrfs_start_workers(&fs_info->submit_workers, 1);