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[Bug 631871] Re: default I/O scheduler should be change from CFQ to deadline

To: ubuntu-boot@xxxxxxxxxxxxxxxxxxx
From: Marius Kotsbak <631871@xxxxxxxxxxxxxxxxxx>
Date: Tue, 02 Oct 2012 12:25:04 -0000
Reply-to: Bug 631871 <631871@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

See bug #1008400. Seems like the default is now changed to deadline.

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Title:
  default I/O scheduler  should be change from CFQ to deadline

Status in Ubuntu:
  Opinion

Bug description:
  i think that the default I/O scheduler

   should be change from   CFQ   to   deadline

  ---------------------------------------------------------------------

  i have test CFQ and deadline I/O scheduler

  on a DELL Latitude 120L with 1GB of RAM and 40GB hard drive

  with EXT4 filesystem and GPT with both I/O schedulers

  and Found that deadline I/O scheduler is the fastest

  --------------------------------------

  also tested
   EXT3 with MBR and deadline I/O scheduler
   EXT3 with GPT and deadline I/O scheduler

   EXT4 with MBR and deadline I/O scheduler
   EXT4 with GPT and deadline I/O scheduler

   EXT4 with MBR and Noop I/O scheduler
   EXT4 with GPT and Noop I/O scheduler

  -- all are faster with 
  deadline  I/O scheduler -OR- Noop I/O scheduler

  ubuntu versions tested - Ubuntu 9.04, Ubuntu 10.04  (LTS),  Xubuntu
  10.04

  --------------------------------------------------------------------

  also test both I/O schedulers on two other computers (total of 3
  computers)

  the deadline I/O scheduler preformed faster then CFQ scheduler

  Noop  I/O scheduler preformed best ( faster then deadline )

  -----------------------------------------------------------------

  also went deadline I/O scheduler is put in Grub ( etc/default/grub OR grub.cfg )
  the boot speed is increased and desktop speed

  OR went deadline I/O scheduler is put in rc.local ( etc/rc.local )
  the desktop speed is increased only

  --------------------------------------------------------------------

  http://en.wikipedia.org/wiki/Deadline_scheduler
  http://en.wikipedia.org/wiki/Noop_scheduler
  http://en.wikipedia.org/wiki/GUID_Partition_Table
  http://en.wikipedia.org/wiki/Ext4
  http://itezer.com/blog/ubuntu-linux/125-Four_Tweaks_for_Using_Ubuntu_with_SSD.html

  http://en.wikipedia.org/wiki/CFQ

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