if BLOCK

  
  menu "IO Schedulers"
  
  config IOSCHED_NOOP
  	bool
  	default y
  	---help---
  	  The no-op I/O scheduler is a minimal scheduler that does basic merging
  	  and sorting. Its main uses include non-disk based block devices like
  	  memory devices, and specialised software or hardware environments
  	  that do their own scheduling and require only minimal assistance from
  	  the kernel.
  
  config IOSCHED_AS
  	tristate "Anticipatory I/O scheduler"
  	default y
  	---help---

  	  The anticipatory I/O scheduler is generally a good choice for most
  	  environments, but is quite large and complex when compared to the
  	  deadline I/O scheduler, it can also be slower in some cases
  	  especially some database loads.

  
  config IOSCHED_DEADLINE
  	tristate "Deadline I/O scheduler"
  	default y
  	---help---
  	  The deadline I/O scheduler is simple and compact, and is often as
  	  good as the anticipatory I/O scheduler, and in some database
  	  workloads, better. In the case of a single process performing I/O to
  	  a disk at any one time, its behaviour is almost identical to the
  	  anticipatory I/O scheduler and so is a good choice.
  
  config IOSCHED_CFQ
  	tristate "CFQ I/O scheduler"
  	default y
  	---help---
  	  The CFQ I/O scheduler tries to distribute bandwidth equally
  	  among all processes in the system. It should provide a fair
  	  working environment, suitable for desktop systems.

  	  This is the default I/O scheduler.

  choice
  	prompt "Default I/O scheduler"

  	default DEFAULT_CFQ

  	help
  	  Select the I/O scheduler which will be used by default for all
  	  block devices.
  
  	config DEFAULT_AS

  		bool "Anticipatory" if IOSCHED_AS=y

  
  	config DEFAULT_DEADLINE

  		bool "Deadline" if IOSCHED_DEADLINE=y

  
  	config DEFAULT_CFQ

  		bool "CFQ" if IOSCHED_CFQ=y

  
  	config DEFAULT_NOOP
  		bool "No-op"
  
  endchoice
  
  config DEFAULT_IOSCHED
  	string
  	default "anticipatory" if DEFAULT_AS
  	default "deadline" if DEFAULT_DEADLINE
  	default "cfq" if DEFAULT_CFQ
  	default "noop" if DEFAULT_NOOP

  endmenu

  
  endif