Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
36 lines
1.2 KiB
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36 lines
1.2 KiB
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===================
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Switching Scheduler
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===================
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Each io queue has a set of io scheduler tunables associated with it. These
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tunables control how the io scheduler works. You can find these entries
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in::
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/sys/block/<device>/queue/iosched
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assuming that you have sysfs mounted on /sys. If you don't have sysfs mounted,
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you can do so by typing::
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# mount none /sys -t sysfs
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It is possible to change the IO scheduler for a given block device on
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the fly to select one of mq-deadline, none, bfq, or kyber schedulers -
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which can improve that device's throughput.
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To set a specific scheduler, simply do this::
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echo SCHEDNAME > /sys/block/DEV/queue/scheduler
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where SCHEDNAME is the name of a defined IO scheduler, and DEV is the
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device name (hda, hdb, sga, or whatever you happen to have).
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The list of defined schedulers can be found by simply doing
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a "cat /sys/block/DEV/queue/scheduler" - the list of valid names
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will be displayed, with the currently selected scheduler in brackets::
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# cat /sys/block/sda/queue/scheduler
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[mq-deadline] kyber bfq none
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# echo none >/sys/block/sda/queue/scheduler
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# cat /sys/block/sda/queue/scheduler
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[none] mq-deadline kyber bfq
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