Diffstat (limited to 'block/Kconfig.iosched')
1 files changed, 4 insertions, 18 deletions
diff --git a/block/Kconfig.iosched b/block/Kconfig.iosched
index 7e803fc8..baad3da 100644
@@ -12,24 +12,14 @@ config IOSCHED_NOOP
that do their own scheduling and require only minimal assistance from
- tristate "Anticipatory I/O scheduler"
- default y
- 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.
tristate "Deadline I/O scheduler"
- 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.
+ The deadline I/O scheduler is simple and compact. It will provide
+ CSCAN service with FIFO expiration of requests, switching to
+ a new point in the service tree and doing a batch of IO from there
+ in case of expiry.
tristate "CFQ I/O scheduler"
@@ -47,9 +37,6 @@ choice
Select the I/O scheduler which will be used by default for all
- config DEFAULT_AS
- bool "Anticipatory" if IOSCHED_AS=y
bool "Deadline" if IOSCHED_DEADLINE=y
@@ -63,7 +50,6 @@ endchoice
- default "anticipatory" if DEFAULT_AS
default "deadline" if DEFAULT_DEADLINE
default "cfq" if DEFAULT_CFQ
default "noop" if DEFAULT_NOOP