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- 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
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