PR_FASTHZ
IGMP_MAX_HOST_REPORT_DELAY * PR_FASTHZ);
timer = igmp->igmp_code * PR_FASTHZ / IGMP_TIMER_SCALE;
IGMP_MAX_HOST_REPORT_DELAY * PR_FASTHZ);
MLD_RANDOM_DELAY(MLD_V1_MAX_RI * PR_FASTHZ);
timer = ntohs(mldh->mld_maxdelay)*PR_FASTHZ/MLD_TIMER_SCALE;