RTT_BAND
int got_num = 0, low_rtt = 0, swap_to_front, rtt_band = RTT_BAND, nth;
if(rtt_band > RTT_BAND)
rtt_band = RTT_BAND;
USEFUL_SERVER_TOP_TIMEOUT - 1000 <= RTT_BAND
?RTT_BAND + 1
int got_num = 0, low_rtt = 0, swap_to_front, rtt_band = RTT_BAND, nth;
if(rtt_band > RTT_BAND)
rtt_band = RTT_BAND;
USEFUL_SERVER_TOP_TIMEOUT - 1000 <= RTT_BAND
?RTT_BAND + 1