> A swapfile on ZFS is a bad idea. Swapped out pages get pushed through
the vfs into zfs and each page of swap will be magnified in the number
of free pages required to get this page out to disk.

currently, swap uses zvol in default. not a swapfile. (actually I also
thinking swapfile is mistake of bad architecture..)

> ..there are known issues with swap on ZFS not working well on heavily
memory loaded systems.

and also, i also see that article, and check it.
It was already optimised.

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  When using swap in ZFS, system stops when you start using swap

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