https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 64570fbc14f8d7cb3fe3995f20e26bc25ce4b2cc authored by Linus Torvalds on 11 October 2021, 00:01:59 UTC
Linux 5.15-rc5
Linux 5.15-rc5
Tip revision: 64570fb
switching-sched.rst
===================
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