Index: benchmark/basic/ttst_lock.c
===================================================================
--- benchmark/basic/ttst_lock.c	(revision b4107c815918e9d1300f3381d29c2a863abf7de8)
+++ benchmark/basic/ttst_lock.c	(revision 7030dab75c493bbd89de53cb88e496019c794ff4)
@@ -3,4 +3,7 @@
 
 #include "bench.h"
+
+// Does a "lock xchg" on entry but a simple "mov" on exit => cheaper as 0 contention. While it has much more code, the
+// bulk is never run.
 
 #define CALIGN __attribute__(( aligned (CACHE_ALIGN) ))