* netbsd/sys/arch/*/conf/GENERIC.v6: enable PULLDOWN_TEST for all   architectures.  this is done because mbuf pullup code in   sys/net/if_loop.c has been found to be a source of performance hit,   and PULLDOWN_TEST code is found to be stable enough. * netbsd/sys/sys/mbuf.h: recover 4.4BSD MINCLSIZE.
* netbsd/sys/arch/*/conf/GENERIC.v6: enable PULLDOWN_TEST for all
  architectures.  this is done because mbuf pullup code in
  sys/net/if_loop.c has been found to be a source of performance hit,
  and PULLDOWN_TEST code is found to be stable enough.
* netbsd/sys/sys/mbuf.h: recover 4.4BSD MINCLSIZE.

MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame