Restore the block length and add a comment.
diff --git a/Modules/collectionsmodule.c b/Modules/collectionsmodule.c
index 27236d9..e52a6a5 100644
--- a/Modules/collectionsmodule.c
+++ b/Modules/collectionsmodule.c
@@ -7,7 +7,13 @@
All rights reserved.
*/
-#define BLOCKLEN 2
+/* The block length may be set to any number over 1. Larger numbers
+ * reduce the number of calls to the memory allocator but take more
+ * memory. Ideally, BLOCKLEN should be set with an eye to the
+ * length of a cache line.
+ */
+
+#define BLOCKLEN 46
#define CENTER ((BLOCKLEN - 1) / 2)
/* A `dequeobject` is composed of a doubly-linked list of `block` nodes.