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