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9361401e 1if BLOCK
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2
3menu "IO Schedulers"
4
5config 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
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15config IOSCHED_DEADLINE
16 tristate "Deadline I/O scheduler"
17 default y
18 ---help---
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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.
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23
24config 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
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30 and low latency working environment, suitable for both desktop
31 and server systems.
32
a8e14b95 33 This is the default I/O scheduler.
1da177e4 34
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35config CFQ_GROUP_IOSCHED
36 bool "CFQ Group Scheduling support"
afc24d49 37 depends on IOSCHED_CFQ && BLK_CGROUP
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38 default n
39 ---help---
40 Enable group IO scheduling in CFQ.
41
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42choice
43 prompt "Default I/O scheduler"
b17fd9bc 44 default DEFAULT_CFQ
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45 help
46 Select the I/O scheduler which will be used by default for all
47 block devices.
48
131dda7f 49 config DEFAULT_DEADLINE
c6ea2ba7 50 bool "Deadline" if IOSCHED_DEADLINE=y
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51
52 config DEFAULT_CFQ
c6ea2ba7 53 bool "CFQ" if IOSCHED_CFQ=y
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54
55 config DEFAULT_NOOP
56 bool "No-op"
57
58endchoice
59
60config DEFAULT_IOSCHED
61 string
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62 default "deadline" if DEFAULT_DEADLINE
63 default "cfq" if DEFAULT_CFQ
64 default "noop" if DEFAULT_NOOP
65
1da177e4 66endmenu
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67
68endif