I've bumped up the zcmd size to reduce the double ioctl() calls and
we're seeing 25-40% improvement clones > 1000. This is an interim fix
until we get a better fix from upstream. I'm going to SRU this once
we're OK with it in Arful. Attached are the new benchmarks.
** Attachment added: "Updated benchmarks comparing old and new performance
stats for large numbers of clones"
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Performance degradation of "zfs clone"
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