blob: 490ef2850faee1f6682e112a7876c35340794502 [file] [log] [blame]
David Howells93614012006-09-30 20:45:40 +02001if BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -07002
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070015config IOSCHED_DEADLINE
16 tristate "Deadline I/O scheduler"
17 default y
18 ---help---
Jens Axboe492af632009-10-03 09:37:51 +020019 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
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
Jens Axboe08dc8722009-10-03 09:40:47 +020030 and low latency working environment, suitable for both desktop
31 and server systems.
32
Jesper Juhla8e14b92007-02-17 20:08:22 +010033 This is the default I/O scheduler.
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
Jens Axboe945ffb62017-01-14 17:11:11 -070035config MQ_IOSCHED_DEADLINE
36 tristate "MQ deadline I/O scheduler"
37 default y
38 ---help---
39 MQ version of the deadline IO scheduler.
40
Vivek Goyal25bc6b02009-12-03 12:59:43 -050041config CFQ_GROUP_IOSCHED
42 bool "CFQ Group Scheduling support"
Vivek Goyalafc24d42010-04-26 19:27:56 +020043 depends on IOSCHED_CFQ && BLK_CGROUP
Vivek Goyal25bc6b02009-12-03 12:59:43 -050044 default n
45 ---help---
46 Enable group IO scheduling in CFQ.
47
Nate Diller131dda72005-10-30 15:02:19 -080048choice
49 prompt "Default I/O scheduler"
Jens Axboeb17fd9b2006-06-19 10:06:48 +020050 default DEFAULT_CFQ
Nate Diller131dda72005-10-30 15:02:19 -080051 help
52 Select the I/O scheduler which will be used by default for all
53 block devices.
54
Nate Diller131dda72005-10-30 15:02:19 -080055 config DEFAULT_DEADLINE
Jens Axboec6ea2ba2005-11-04 08:44:58 +010056 bool "Deadline" if IOSCHED_DEADLINE=y
Nate Diller131dda72005-10-30 15:02:19 -080057
58 config DEFAULT_CFQ
Jens Axboec6ea2ba2005-11-04 08:44:58 +010059 bool "CFQ" if IOSCHED_CFQ=y
Nate Diller131dda72005-10-30 15:02:19 -080060
61 config DEFAULT_NOOP
62 bool "No-op"
63
64endchoice
65
66config DEFAULT_IOSCHED
67 string
Nate Diller131dda72005-10-30 15:02:19 -080068 default "deadline" if DEFAULT_DEADLINE
69 default "cfq" if DEFAULT_CFQ
70 default "noop" if DEFAULT_NOOP
71
Linus Torvalds1da177e2005-04-16 15:20:36 -070072endmenu
David Howells93614012006-09-30 20:45:40 +020073
74endif