Reading RELENG_6 kernel tunables?

[David Kelly]

/usr/src/sys/conf/NOTES says:

# 2.  In /boot/loader.conf, set the tunables kern.maxswzone,
#     kern.maxbcache, kern.maxtsiz, kern.dfldsiz, kern.maxdsiz,
#     kern.dflssiz, kern.maxssiz and kern.sgrowsiz.

Is loader.conf in some sort of different world than sysctl(8)? Shouldn't
I be able to at least view the current settings using sysctl? I
understand these are things which may have to be set in stone before the
kernel starts running proper. Just want to see the current value.

# sysctl kern.maxssiz
sysctl: unknown oid 'kern.maxssiz'

Show how can a view the current setting and confirm my messing with
loader.conf took hold?

-- 
David Kelly N4HHE, dkelly at HiWAAY.net
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Whom computers would destroy, they must first drive mad.