1. what is your ZFS configuration (number of drives?)
2. size of your system (total memory, free memory).
3. Do your drive(s) suffer from large I/O latencies?
   - what is the output from iostat -mx

You may possibly get some benefit from setting spl_kmem_cache_slab_limit
to zero as a module parameter for the spl ZoL kernel module. This avoids
SLUB slab merging entirely and maybe helpful from anecdotal evidence
I've seen.

** Changed in: zfs-linux (Ubuntu)
       Status: New => Triaged

** Changed in: zfs-linux (Ubuntu)
   Importance: Undecided => Medium

** Changed in: zfs-linux (Ubuntu)
     Assignee: (unassigned) => Colin Ian King (colin-king)

** Changed in: zfs-linux (Ubuntu)
       Status: Triaged => Incomplete

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https://bugs.launchpad.net/bugs/1725859

Title:
  zfs frequently hangs (up to 30 secs) during sequential read

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