IPF_HZ_DIVIDE
period = seconds * IPF_HZ_DIVIDE;
#define IPF_TTLVAL(x) (((x) / IPF_HZ_MULT) * IPF_HZ_DIVIDE)
(hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT,
callout_reset(&softc->ipf_slow_ch, (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT,
IPFTQ_INIT(&softs->ipf_state_pending, IPF_HZ_DIVIDE, "ipftq pending");