I tried install latest Ubuntu Server image on my machine and confirmed
that we are using CFQ for default IO scheduler for both server and
desktop now.

Hark, we merged -server and -generic kernel image together for easier
maintenance and most difference can be switched via kernel command line
or user space interface. As Leann said, we can add "elevator=deadline"
in kernel boot command line to use Deadline I/O scheduler  by default.
Or just change /sys/block/DEV/queue/scheduler from CFQ to deadline.

If it's necessary, I'm think about add some script to do this in our
server image. But that probably related to grub, upstart init script or
other user space utils not kernel issue now.

-Bryan

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https://bugs.launchpad.net/bugs/1008400

Title:
  Ubuntu server uses CFQ scheduler instead of deadline

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