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To: des@des.no
From: "M. Warner Losh" <imp@bsdimp.com>
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Subject: Re: cvs commit:
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In message: <86acpnmzih.fsf@xps.des.no>
            des@des.no (Dag-Erling Sm=F8rgrav) writes:
: John Baldwin <jhb@FreeBSD.org> writes:
: > How about a custom boot kernel?  When I suggested 12MB rather than
: > 7MB in the original PR, I was thinking of the case of building a
: > stripped-down custom kernel.  GENERIC certainly isn't going to fit
: > well in 16MB.
: =

: A custom kernel should work better.  I figured out that the "missing"=

: memory is in fact the memory used by the kernel, so a system with a
: trimmed kernel should have a lot more memory available.  I'll run som=
e
: more tests...

I've booted a stripped down (but not minimal) kernel with
hw.physmem=3D10M to single user, but couldn't even get to multi-user
with 16M:  Too many processes and too much swapping (I didn't trim my
enabled list on my laptop).  If I booted a minimal kernel, and did
some creative trimming, I think I can get down closer to 6M to 8M on a
fairly small system (no acpi, etc), but it would be painful to run in
that environemnt, unless you had special needs (eg, it was an embedded
platform).

Warner