KEEPALIVE_SECS
ng_callout(&sc->handle, node, NULL, (hz * KEEPALIVE_SECS),
"keepalive period: %d sec; ", KEEPALIVE_SECS);
stat->keepAlivePeriod = KEEPALIVE_SECS;
ng_callout(&sc->handle, node, NULL, (hz * KEEPALIVE_SECS),