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"
   
https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1567557/+attachment/4928925/+files/zfs-clone-performance.ods

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https://bugs.launchpad.net/bugs/1567557

Title:
  Performance degradation of "zfs clone"

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