Recently, patches were applied to the netbsd-7 branch to build the DRMKMS
kernel as part of the regular i386/amd64 release build and offer it as
an option in 'sysinst'.
http://mail-index.netbsd.org/source-changes/2014/12/04/msg061139.html
The resulting kernel weighs in at 100+MB rather than ~18
Looking at
http://nyftp.netbsd.org/pub/NetBSD-daily/netbsd-7/201412042050Z/amd64/binary/sets/
you can see:
kern-DRMKMS.tgz 04-Dec-2014 21:48 7434kB
kern-GENERIC.tgz 04-Dec-2014 21:48 6283kB
kern-XEN3_DOM0.tgz 04-Dec
OK, it must have been some weird interference caused by an update build
and the existing ${OBJDIR}/.../compile/DRMKMS directory from before
the patch.
Removing the kernel build directory and repeating the build produced
reasonable results.
--
|/"\ John D. Baker, KN5UKS NetBSD D