diff -r e72e669dd51f -r 6446e9b37c8b contrib/perf.py
--- a/contrib/perf.py	Tue Jan 05 17:08:14 2016 -0800
+++ b/contrib/perf.py	Tue Jan 05 19:51:51 2016 -0800
@@ -568,7 +568,7 @@
         r.revision(node)
 
     chain = r._deltachain(rev)[0]
-    data = r._chunkraw(chain[0], chain[-1])
+    data = r._chunkraw(chain[0], chain[-1])[1]
     bins = r._chunks(chain)
     text = str(bins[0])
     bins = bins[1:]