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+
+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 the default disk scheduler. It 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.
+
+choice
+ prompt "Default I/O scheduler"
+ default DEFAULT_AS
+ help
+ Select the I/O scheduler which will be used by default for all
+ block devices.
+
+ config DEFAULT_AS
+ bool "Anticipatory" if IOSCHED_AS
+
+ config DEFAULT_DEADLINE
+ bool "Deadline" if IOSCHED_DEADLINE
+
+ config DEFAULT_CFQ
+ bool "CFQ" if IOSCHED_CFQ
+
+ 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