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

[DLHDavidLH]

bug in CFQ I/O scheduler ?

** Description changed:

- 
  i think that the default I/O scheduler
  
-  should be change from   CFQ   to   deadline
+  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
+  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 deadline I/O scheduler
+  EXT4 with GPT and deadline I/O scheduler
  
- -- all are faster with 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 the best/fastest
+ 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

-- 
default I/O scheduler  should be change from CFQ to deadline
https://bugs.launchpad.net/bugs/631871
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