[Bug 257314] FBSD 13 crash after some KDE parts crash supposing out of swap space

From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 28 Jul 2021 21:34:02 UTC

--- Comment #39 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Graham Perrin from comment #38)

# sysctl -T vfs.zfs.arc.min
vfs.zfs.arc.min: 0

Note:      -T      Display only variables that are settable via loader

# sysctl -W vfs.zfs.arc.min
vfs.zfs.arc.min: 0

Note:      -W      Display only writable variables that are not statistical. 
             for determining the set of runtime tunable sysctls.

So vfs.zfs.arc.min looks to be both a load-time tunable (-T) and a
later writeable variable (-W).

To illustrate what happens for -T and -W output when
the name is loader-tunable but not later a writable
variable (as an example):

# sysctl -W kern.maxproc
# sysctl -T kern.maxproc
kern.maxproc: 70308

I'll note that I also see the 0 value for vfs.zfs.arc.min
but I do no tuning of ZFS (I use defaults) and the system
used for the above commands has 64 GiByte of RAM. My usage
context is very different from chrome/gimp/plasmashell/Xorg
and so my lack of seeing OOM activity does not mean much
for the bugzilla report.

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