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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1725859 Title: zfs frequently hangs (up to 30 secs) during sequential read To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1725859/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs