- * for random io where the writes extend the file, it will typically
- * be laid out with the block scattered as written. it's faster to
- * read them in in that order again, so don't sort
+ * We don't need to sort the entries, if:
+ *
+ * Sequential writes, or
+ * Random writes that lay out the file as it goes along
+ *
+ * For both these cases, just reading back data in the order we
+ * wrote it out is the fastest.