[Bug 2045708] Re: Improve debian/99-gce.rules to set schedulers based on disk

[Philip Roche]

** Also affects: gce-compute-image-packages (Ubuntu Jammy)
   Importance: Undecided
       Status: New

** Also affects: gce-compute-image-packages (Ubuntu Mantic)
   Importance: Undecided
       Status: New

** Also affects: gce-compute-image-packages (Ubuntu Focal)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/2045708

Title:
  Improve debian/99-gce.rules to set schedulers based on disk

Status in gce-compute-image-packages package in Ubuntu:
  Fix Released
Status in gce-compute-image-packages source package in Focal:
  New
Status in gce-compute-image-packages source package in Jammy:
  New
Status in gce-compute-image-packages source package in Mantic:
  New

Bug description:
  We should reduce the `udev` rule scope here and change I/O scheduler.
  The previous `udev` rule was drastically reducing the bootspeed on SSD
  backed instances, as the `noop` scheduler is pretty old school.

  I did pretty extensive experimentation and found that swapping to
  "none" in this file yielded the best results on HDD instances (>10s
  improvement in boot time on average). Letting SSD's just roll
  independently also seemed to give the best speeds.

  [ Impact ]

   * If an end user launches an Ubuntu instance in GCE backed with a HDD, no
     scheduler will be used natively.

   * This package is provided upstream by Google themselves, and is part of a
     collection of tools and that ensures that the Ubuntu images published to GCE
     run properly on the platform.

  [Test Case]

  When this package lands in -proposed, the following will happen:

   * an image built with this package from -proposed will be built for GCE and
     published in the `ubuntu-os-cloud-image-proposed` project
   * The image will go through CPC's own CTF framework, and assuming it passes
     will be handed to the Google team to perform their own verification.
   * This can also be done independently with a PPA hooked into CPC's bootstrap 
     scripts (kajiya's PPA here: [0])

  If all the testing indicates that the image containing the new package
  is good, verification is considered finished.

  [0]: https://launchpad.net/~kajiya/+archive/ubuntu/gce-compute-image-
  packages

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