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[Marcelo Cerri <1813211@xxxxxxxxxxxxxxxxxx>]

** Also affects: linux-azure (Ubuntu Disco)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1813211

Title:
  Allow I/O schedulers to be loaded with modprobe in linux-azure

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 Bionic:
  Fix Released
Status in linux-azure source package in Cosmic:
  Fix Released
Status in linux-azure source package in Disco:
  New

Bug description:
  There was a previous request in bug
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1671203 to limit
  the IO scheduler to NOOP in linux-azure. The other schedulers were
  turned off and NOOP was made the default.

  However with new upstream releases, new schedulers where added and
  linux-azure inherited the default config value for them from the
  master kernel. That's why there are some IO schedulers built as
  modules in the extra package (mq-deadline and kyber-iosched). In order
  to use those two modules, one needs to install the -extra package and
  modprobe the modules first:

  # tail /sys/block/sd*/queue/scheduler
  ==> /sys/block/sda/queue/scheduler <==
  [none] 

  ==> /sys/block/sdb/queue/scheduler <==
  [none] 

  # apt install linux-modules-extra-4.15.0-1036-azure

  # modprobe kyber-iosched
  # tail /sys/block/sd*/queue/scheduler
  ==> /sys/block/sda/queue/scheduler <==
  [none] kyber 

  ==> /sys/block/sdb/queue/scheduler <==
  [none] kyber 

  # modprobe mq-deadline
  # tail /sys/block/sd*/queue/scheduler
  ==> /sys/block/sda/queue/scheduler <==
  [none] kyber mq-deadline 

  ==> /sys/block/sdb/queue/scheduler <==
  [none] kyber mq-deadline 

  
  The schedulers cfq and deadline have been completely disabled in LP bug #1671203 so they cannot be added with modprobe.

  This is a request to move back the cfq and deadline schedulers along
  with the mq-deadline and kyber-iosched schedulers to the main linux-
  azure package (in other words, not in the -extra package) and allow
  the users to be able to modprobe the schedulers when needed.

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