> > add "options VMSWAP" to non INSTALL kernels.
> 
> This is disabling the ability to swap from INSTALL kernels? 

yes.

> In the past on systems with limited memory, adding swap space on the
> fly can help finish an install.  How much space does enabling this
> option save?

don't worry, i have already reverted the change.
(for another reason, tho.)

YAMAMOTO Takashi