How to change rootfs from official RPI3 image

[Steve O'Hara-Smith]

On Wed, 28 Aug 2019 05:55:41 -0400
Ricky Zhang <zhangchaowang at gmail.com> wrote:

> - The 1GB memory is too small for ZFS or running jail. I can’t even clone
> FreeBSD port form Git repo due to OOM. 

	With small memory it is worthwhile severely restricting the ARC
allocation for ZFS by setting vfs.zfs.arc_max to match vfs.zfs.arc_min (I'm
not sure if you can reduce both safely - worth experimenting). Ny default
ZFS is configured too greedy to run much else unless you have a lot of
memory.

-- 
Steve O'Hara-Smith <steve at sohara.org>