linux-stable/Documentation/block/switching-sched.rst
Marcos Paulo de Souza f97eeb6cfd Documenation: switching-sched: Remove notes about elevator argument
This argument was ignored since blk-mq was set as default, so remove it
from documentation.

Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Marcos Paulo de Souza <marcos.souza.org@gmail.com>

.txt file is now .rst

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-09-03 08:04:02 -06:00

35 lines
1.2 KiB
ReStructuredText

===================
Switching Scheduler
===================
Each io queue has a set of io scheduler tunables associated with it. These
tunables control how the io scheduler works. You can find these entries
in::
/sys/block/<device>/queue/iosched
assuming that you have sysfs mounted on /sys. If you don't have sysfs mounted,
you can do so by typing::
# mount none /sys -t sysfs
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::
echo SCHEDNAME > /sys/block/DEV/queue/scheduler
where SCHEDNAME is the name of a defined IO scheduler, and DEV is the
device name (hda, hdb, sga, or whatever you happen to have).
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/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