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35 lines
1.2 KiB
35 lines
1.2 KiB
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Switching Scheduler |
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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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