SCTP_RTT_SHIFT
uint32_t srtt = net->lastsa >> SCTP_RTT_SHIFT;
net->RTO = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
net->RTO = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
cur_rto = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
paddri->spinfo_srtt = net->lastsa >> SCTP_RTT_SHIFT;
sstat->sstat_primary.spinfo_srtt = net->lastsa >> SCTP_RTT_SHIFT;
rtt -= (net->lastsa >> SCTP_RTT_SHIFT);
net->lastsa = rtt << SCTP_RTT_SHIFT;
new_rto = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;