[Bug 225197] `make buildkernel' fails on a machine with 1GB RAM

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225197

--- Comment #8 from Mark Millard <marklmi26-fbsd at yahoo.com> ---
(In reply to Pedro F. Giffuni from comment #7)

Relative to increasing swap on a RPi2B V1.1 and
its 1 GiByte of RAM, I'll reference:

https://lists.freebsd.org/pipermail/freebsd-hackers/2018-January/052165.html

which is an example of pfault/vmwait mixure hangups during buildworld
when top shows:

Swap: 2048M Total, 52M Used, 1996M Free, 2% Inuse

The RPi2B V1.1 was getting the report:

warning: total configured swap (524288 pages) exceeds maximum recommended
amount (405460 pages).

So, the hangup is apparently an example of the "man 8 loader" note:

                  Note that swap metadata can be fragmented, which means that
                  the system can run out of space before it reaches the
                  theoretical limit.  Therefore, care should be taken to not
                  configure more swap than approximately half of the
                  theoretical maximum.

ctfmerge is not the only place that people have trouble with
self-hosting based on 1 GiByte of RAM for a 32-bit architecture.

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