PF_SYNCOOKIES_HIWATPCT
pf->syncookieswat[1] = PF_SYNCOOKIES_HIWATPCT;
w->hi = PF_SYNCOOKIES_HIWATPCT;
#define PF_SYNCOOKIES_LOWATPCT (PF_SYNCOOKIES_HIWATPCT / 2)
V_pf_syncookie_status.hiwat = PF_SYNCOOKIES_HIWATPCT *