i have pentium 133 with 128MB RAM.
system works much faster when i set REALEXTMEM=64512 (to limit all memory
to 64MB) until it start swapping.

is it possible to limit it to 64MB but use another 64MB for buffer cache
and/or md device?

NetBSD 1.5.2

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Instead of asking why a piece of software is using "1970s technology,"
start asking why software is ignoring 30 years of accumulated wisdom.