How to select the mq-deadline scheduler?

Richard Ayotte

I'm trying to select the new mq-deadline io scheduler but it doesn't seem available.

$ cat /sys/block/sda/queue/scheduler 
noop [deadline] 

kernel:

$ uname -a
Linux pluto 4.11.6-zenbook #1 SMP Wed Jun 21 09:39:34 EDT 2017 x86_64 GNU/Linux

dmesg:

$ sudo dmesg|grep deadline
[    0.077863] TSC deadline timer enabled
[    1.383260] io scheduler deadline registered (default)
[    1.383261] io scheduler mq-deadline registered
Richard Ayotte

You also need to enable CONFIG_SCSI_MQ_DEFAULT

Symbol: SCSI_MQ_DEFAULT [=y]
Type  : boolean
Prompt: SCSI: use blk-mq I/O path by default
  Location:
    -> Device Drivers
      -> SCSI device support
  Defined at drivers/scsi/Kconfig:50
  Depends on: SCSI [=y]

And voila

$ cat /sys/block/sda/queue/scheduler
[mq-deadline] none

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