$ svn diff arc_summary.py
Index: arc_summary.py
===================================================================
--- arc_summary.py	(revision 10156)
+++ arc_summary.py	(working copy)
@@ -644,7 +644,7 @@
             if not tunable:
                 continue
             tunable = tunable.strip()
-            name, description = split("=")[0:2]
+            name, description = '='.split()[:2]
             name = name.strip()
             description = description.strip()
             if not description: