branches/plugin rb://242

Let the master thread sleep if the amount of work to be done is
calibrated as taking less than a second.

Approved by: Heikki

srv/srv0srv.c

@@ -2524,9 +2524,12 @@ loop:
 						BUF_FLUSH_LIST,
 						n_flush,
 						IB_ULONGLONG_MAX);
+
+				if (n_flush == PCT_IO(100)) {
 					skip_sleep = TRUE;
 				}
 			}
+		}
 
 		if (srv_activity_count == old_activity_count) {