boot safe mode question and kern.ipc.nmb* on live cd

[rmkml]

Hi,
Im test dfbsd v1.10.1 on intel dual core 2 plateform
normal boot and single boot not work (pb irq11)
but safe mode is ok on live cd,
but Im desired boot on safe mode with enhanced kern.ipc.nmb*
(kern.ipc.nmbufs=65536 and kern.ipc.nmbclusters=32768)
is it possible ?
 OK boot safe #Â nt work
but how please ?
 OK set kern.ipc.nmbufs=65536 # not tested
 OK set kern.ipc.nmbclusters=32768 # not tested
Best Regards
Rmkml