[Bug 261212] Update the ZFS chapter (20) of the FreeBSD Handbook, and other OpenZFS-related pages

From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 26 Jul 2022 02:48:11 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261212

--- Comment #4 from Graham Perrin <grahamperrin@gmail.com> ---
From <https://forums.freebsd.org/posts/558971>: 

> … tunable is a noun; "… basically a special type of sysctl that 
> gets its initial value from the kernel environment (set by loader)".


'Tuning' <https://docs.freebsd.org/en/books/handbook/zfs/#zfs-advanced-tuning>
(currently 20.6.1) lists some tunables. 


'Loader Tunables'
<https://docs.freebsd.org/en/books/handbook/zfs/#_loader_tunables> (currently
20.6.2.3) begins: 

> Increases the kmem address space on all FreeBSD architectures. …

As a beginning, that's potentially misleading. 

The subsection heading can be, more simply: 'Tunables'.

If it's truly on all FreeBSD architectures, then why is it under an i386
heading?

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