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https://bugs.launchpad.net/bugs/1819689

Title:
  [linux-azure] Commit To Improve NVMe Performance

Status in linux-azure package in Ubuntu:
  Fix Released
Status in linux-azure source package in Xenial:
  Fix Released
Status in linux-azure source package in Cosmic:
  Fix Released

Bug description:
  In bug 1818138,  the config option CONFIG_NO_HZ_FULL was requested to
  be enabled in the linux-azure kernels(currently 4.15 and 4.18) in
  order to increase NVME disks performance.

  To achieve the peak IOPs we are seeing in testing, the following commit is 
also needed:
  7ac257b862f2c (“blk-mq: remove the request_list usage”)

  This commit cleans up unused code in block-mq (mq uses pre-allocated
  tags to allocate request, not request_list as it's used only in legacy
  queue).  The commit saves a bunch of rcu locks on I/O queuing path,
  which increases the achievable IOPs seen in testing.

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