path: root/Documentation
diff options
authorAndreas Herrmann <>2019-06-12 08:50:09 +0200
committerJens Axboe <>2019-06-13 03:00:30 -0600
commit8614b0085d98482a065f0a308d715b9d4212aebf (patch)
tree1ef3d5f742f7092a07a9a76d5bf842cbf352080d /Documentation
parent154085ffdcc6875851b80a5d2bd759bbf687b001 (diff)
block/switching-sched.txt: Update to blk-mq schedulers
Remove references to CFQ and legacy block layer which are gone. Update example with what's available under blk-mq. Signed-off-by: Andreas Herrmann <> Signed-off-by: Jens Axboe <>
Diffstat (limited to 'Documentation')
1 files changed, 8 insertions, 10 deletions
diff --git a/Documentation/block/switching-sched.txt b/Documentation/block/switching-sched.txt
index 3b2612e342f1..7977f6fb8b20 100644
--- a/Documentation/block/switching-sched.txt
+++ b/Documentation/block/switching-sched.txt
@@ -13,11 +13,9 @@ you can do so by typing:
# mount none /sys -t sysfs
-As of the Linux 2.6.10 kernel, it is now possible to change the
-IO scheduler for a given block device on the fly (thus making it possible,
-for instance, to set the CFQ scheduler for the system default, but
-set a specific device to use the deadline or noop schedulers - which
-can improve that device's throughput).
+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:
@@ -30,8 +28,8 @@ 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/hda/queue/scheduler
-noop deadline [cfq]
-# echo deadline > /sys/block/hda/queue/scheduler
-# cat /sys/block/hda/queue/scheduler
-noop [deadline] cfq
+# 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