69 lines
1.9 KiB
Text
69 lines
1.9 KiB
Text
|
|
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_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
|