... rocks! However, some early VM-related kernel panics - kmem_map too small panic - knocked confidence a bit. Seems ZFS really nails the kernel's memory demands.
Happily "the vm_kern.c.2 patch" (it's well known!) sorted things. I stressed ZFS-backed IO massively without any further wobbles.
Now I can micro-quota all my jail(8)s with obsession!
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