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
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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