Commit 8614b008 authored by Andreas Herrmann's avatar Andreas Herrmann Committed by Jens Axboe
Browse files

block/switching-sched.txt: Update to blk-mq schedulers 



Remove references to CFQ and legacy block layer which are gone.
Update example with what's available under blk-mq.

Signed-off-by: default avatarAndreas Herrmann <aherrmann@suse.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 154085ff

Documentation/block/switching-sched.txt

+8 −10
Original line number Diff line number Diff line
@@ -13,11 +13,9 @@ you can do so by typing: 


# mount none /sys -t sysfs



As of the Linux 2.6.10 kernel, it is now possible to change the

IO scheduler for a given block device on the fly (thus making it possible,

for instance, to set the CFQ scheduler for the system default, but

set a specific device to use the deadline or noop schedulers - which

can improve that device's throughput).

It is possible to change the IO scheduler for a given block device on

the fly to select one of mq-deadline, none, bfq, or kyber schedulers -

which can improve that device's throughput.



To set a specific scheduler, simply do this:
@@ -30,8 +28,8 @@ The list of defined schedulers can be found by simply doing 
a "cat /sys/block/DEV/queue/scheduler" - the list of valid names

will be displayed, with the currently selected scheduler in brackets:



# cat /sys/block/hda/queue/scheduler

noop deadline [cfq]

# echo deadline > /sys/block/hda/queue/scheduler

# cat /sys/block/hda/queue/scheduler

noop [deadline] cfq
 
# cat /sys/block/sda/queue/scheduler

[mq-deadline] kyber bfq none

# echo none >/sys/block/sda/queue/scheduler

# cat /sys/block/sda/queue/scheduler

[none] mq-deadline kyber bfq

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