NS2FLOATMS
(void) snprintf(buf, bufsize, "%.2fms", NS2FLOATMS(ackproc - start));
(void) snprintf(buf, bufsize, "%.2fms", NS2FLOATMS(ackrecv - sent));
(void) snprintf(buf, bufsize, "%.2fms", NS2FLOATMS(rttavg));
(void) snprintf(buf, bufsize, "%.2fms", NS2FLOATMS(rttdev));