path: root/block/Kconfig.iosched (plain)
blob: 421bef9c4c48d26c035792716064e9f273253c6e

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
69