Subversion Repositories test_project

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