pkg upgrade, ZFS, swap on, vm.pageout_oom_seq

Reply: Graham Perrin : "Re: pkg upgrade, ZFS, swap on, vm.pageout_oom_seq"
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In reply to: Graham Perrin : "pkg upgrade, vfs.zfs.arc.free_target, vfs.zfs.arc.sys_free (was: CFT: pkgbase support in 15.0)"
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From: Graham Perrin <grahamperrin_at_gmail.com>
Date: Sun, 07 Sep 2025 02:10:02 UTC

Kubuntu host, VirtualBox guest, pkg 2.2.2, 15.0-PRERELEASE.

Slow physical storage for the virtual drive: a mobile HDD on USB.

bsdinstall, ZFS, 8 G swap, pkgbase, all components, then:

|pkg install --glob 'FreeBSD-kernel-generic-nodebug*'|

= 568 base packages.

vm.pageout_oom_seq=120

After base installation: 1 G memory given to the guest, GENERIC-NODEBUG, 
dmesg showed 932  MB avail.

Fetch then install some FreeBSD-ports packages. From 
<https://gist.github.com/grahamperrin/c1518052ef0c6822dab62f38ea5545c7?permalink_comment_id=5749571#gistcomment-5749571>:

|drm-kmodfirefoxgitupgothtophw-probekdelsblklynxnanopciutilsplasma6-sddm-kcmroxtermsddmuclcmdusbutilsvirtualbox-ose-additionsxfcexorg|

= 965 non-base packages installed in 4 minutes, 33 seconds.

Then, at ttyv3:

htop

at ttyv2:

tail -f -n 0 /var/log/messages

at ttyv1:

|/usr/bin/time -h pkg upgrade -fqUy|

= a quiet forced upgrade of all packages, complete in 17 minutes, 2.62 
seconds.

<https://i.imgur.com/mvFvcyX.png>

With htop, I observed swap usage sometimes above 2 G. Never 3 or more, 
although I did not watch constantly.