1 if BLOCK
2
3 menu "IO Schedulers"
4
5 config IOSCHED_NOOP
6 bool
7 default y
8 ---help---
9 The no-op I/O scheduler is a minimal scheduler that does basic merging
10 and sorting. Its main uses include non-disk based block devices like
11 memory devices, and specialised software or hardware environments
12 that do their own scheduling and require only minimal assistance from
13 the kernel.
14
15 config IOSCHED_AS
16 tristate "Anticipatory I/O scheduler"
17 default y
18 ---help---
19 The anticipatory I/O scheduler is generally a good choice for most
20 environments, but is quite large and complex when compared to the
21 deadline I/O scheduler, it can also be slower in some cases
22 especially some database loads.
23
24 config IOSCHED_DEADLINE
25 tristate "Deadline I/O scheduler"
26 default y
27 ---help---
28 The deadline I/O scheduler is simple and compact, and is often as
29 good as the anticipatory I/O scheduler, and in some database
30 workloads, better. In the case of a single process performing I/O to
31 a disk at any one time, its behaviour is almost identical to the
32 anticipatory I/O scheduler and so is a good choice.
33
34 config IOSCHED_CFQ
35 tristate "CFQ I/O scheduler"
36 default y
37 ---help---
38 The CFQ I/O scheduler tries to distribute bandwidth equally
39 among all processes in the system. It should provide a fair
40 working environment, suitable for desktop systems.
41 This is the default I/O scheduler.
42
43 choice
44 prompt "Default I/O scheduler"
45 default DEFAULT_CFQ
46 help
47 Select the I/O scheduler which will be used by default for all
48 block devices.
49
50 config DEFAULT_AS
51 bool "Anticipatory" if IOSCHED_AS=y
52
53 config DEFAULT_DEADLINE
54 bool "Deadline" if IOSCHED_DEADLINE=y
55
56 config DEFAULT_CFQ
57 bool "CFQ" if IOSCHED_CFQ=y
58
59 config DEFAULT_NOOP
60 bool "No-op"
61
62 endchoice
63
64 config DEFAULT_IOSCHED
65 string
66 default "anticipatory" if DEFAULT_AS
67 default "deadline" if DEFAULT_DEADLINE
68 default "cfq" if DEFAULT_CFQ
69 default "noop" if DEFAULT_NOOP
70
71 endmenu
72
73 endif
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