VARx(ev_tstamp, now_floor) /* last time we refreshed rt_time */
VARx(ev_tstamp, mn_now) /* monotonic clock "now" */
-VARx(ev_tstamp, rt_now)
+VARx(ev_tstamp, ev_rt_now)
VARx(ev_tstamp, rtmn_diff) /* difference realtime - monotonic time */
VARx(int, method)