ARC size on Linux smaller by default - tuning zfs_arc_max?

Default ARC sizes are different on Linux and FreeBSD: https://openzfs.github.io/openzfs-docs/Performance and Tuning/Module Parameters.html#zfs-arc-max

• Linux: 1/2 of system memory
• FreeBSD: the larger of all_system_memory - 1GB and 5/8 × all_system_memory

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For a NAS with over 32GB RAM, I don't think the Linux formula is a great fit.

My ARC is capped at 50 GB and there's a bunch of wasted memory (and an obscenely large "services" - but I...

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