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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_DEADLINE
16 tristate "Deadline I/O scheduler"
17 default y
18 ---help---
19 The deadline I/O scheduler is simple and compact. It will provide
20 CSCAN service with FIFO expiration of requests, switching to
21 a new point in the service tree and doing a batch of IO from there
22 in case of expiry.
23
24 config IOSCHED_CFQ
25 tristate "CFQ I/O scheduler"
26 default y
27 ---help---
28 The CFQ I/O scheduler tries to distribute bandwidth equally
29 among all processes in the system. It should provide a fair
30 and low latency working environment, suitable for both desktop
31 and server systems.
32
33 This is the default I/O scheduler.
34
35 config CFQ_GROUP_IOSCHED
36 bool "CFQ Group Scheduling support"
37 depends on IOSCHED_CFQ && BLK_CGROUP
38 default n
39 ---help---
40 Enable group IO scheduling in CFQ.
41
42 choice
43 prompt "Default I/O scheduler"
44 default DEFAULT_CFQ
45 help
46 Select the I/O scheduler which will be used by default for all
47 block devices.
48
49 config DEFAULT_DEADLINE
50 bool "Deadline" if IOSCHED_DEADLINE=y
51
52 config DEFAULT_CFQ
53 bool "CFQ" if IOSCHED_CFQ=y
54
55 config DEFAULT_NOOP
56 bool "No-op"
57
58 endchoice
59
60 config DEFAULT_IOSCHED
61 string
62 default "deadline" if DEFAULT_DEADLINE
63 default "cfq" if DEFAULT_CFQ
64 default "noop" if DEFAULT_NOOP
65
66 endmenu
67
68 endif