** Changed in: zfs-linux (Ubuntu)
       Status: In Progress => Fix Committed

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  Fix ARC hit rate

Status in zfs-linux package in Ubuntu:
  Fix Committed

Bug description:
  Upstream commit:

  "When the compressed ARC feature was added in commit d3c2ae1
  the method of reference counting in the ARC was modified.  As
  part of this accounting change the arc_buf_add_ref() function
  was removed entirely.

  This would have be fine but the arc_buf_add_ref() function
  served a second undocumented purpose of updating the ARC access
  information when taking a hold on a dbuf.  Without this logic
  in place a cached dbuf would not migrate its associated
  arc_buf_hdr_t to the MFU list.  This would negatively impact
  the ARC hit rate, particularly on systems with a small ARC."

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