bsdinstall: system requirements: memory/RAM: ZFS: 2048 MB for an ordinary installation plus a desktop environment

From: Graham Perrin <grahamperrin_at_gmail.com>
Date: Sun, 28 Sep 2025 10:47:03 UTC
Follow-up to <https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287719#c6>

Good news.

2048 MB is sufficient with root-on-ZFS for an ordinary installation
(more than base, less than all of FreeBSD-base) of 15.0-ALPHA4
plus these five non-base packages, some of which are meta:

     kde plasma6-sddm-kcm sddm virtualbox-guest-additions xorg

Beyond initial installations: with 4 G swap enabled, I repeatedly
tested forced reinstallation of all packages,

     pkg upgrade -fUy

1077 packages, 1886 steps. Success.

----

With swap disabled, which I would not recommend:

- reinstallation failed, switch from ttyv1 to ttyv2 was
   impossible, and so on, so I attempted a shut down
   <https://i.imgur.com/RftLGMu.png>

- shut down failed

- following a forced stop of the computer, SDDM and the
   desktop environment were unsable (pkg issue 2441,
   second incident this morning).