From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- Documentation/block/switching-sched.rst | 35 +++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 Documentation/block/switching-sched.rst (limited to 'Documentation/block/switching-sched.rst') diff --git a/Documentation/block/switching-sched.rst b/Documentation/block/switching-sched.rst new file mode 100644 index 0000000000..520f6b8575 --- /dev/null +++ b/Documentation/block/switching-sched.rst @@ -0,0 +1,35 @@ +=================== +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//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 -- cgit v1.2.3