Internet:
Destination        Gateway            Flags     Netif Expire
0.0.0.0/8          link#2             U          fxp0
default            10.0.0.125         UGS         re0

    The vm.overcommit sysctl defines the overcommit behaviour of the vm
     subsystem.  The virtual memory system always does accounting of the swap
     space reservation, both total for system and per-user.  Corresponding
     values are available through sysctl vm.swap_total, that gives the total
     bytes available for swapping, and vm.swap_reserved, that gives number of
     bytes that may be needed to back all currently allocated anonymous
     memory.

     Setting bit 0 of the vm.overcommit sysctl causes the virtual memory
     system to return failure to the process when allocation of memory causes
     vm.swap_reserved to exceed vm.swap_total.  Bit 1 of the sysctl enforces
     RLIMIT_SWAP limit (see getrlimit(2)).  Root is exempt from this limit.
     Bit 2 allows to count most of the physical memory as allocatable, except
     wired and free reserved pages (accounted by vm.stats.vm.v_free_target and
     vm.stats.vm.v_wire_count sysctls, respectively).