+ select(1, (fd_set *) 0, (fd_set *) 0, (fd_set *) 0, &tv);
+#elif defined(SLEEP_OLD_METHOD)
+ /* Tis uses gettimeofday (underneath the Timestamp), which has a
+ * resolution of upto microseconds. I've found it's good to within
+ * about 10 usecs. I used to do calibration, but iperf automatically
+ * adjusts itself so that isn't necesary, and it causes some problems
+ * if the calibration adjustment is larger than your sleep time.
+ * Note: I found this has problems - if the loop gets interrupted,
+ * long sleeps can result. I found up to 50..60msec. -- Gerrit */