Sorry I don't finded answer on my question.
Why BFQ scheduler available only for NVMe device?
$ find /sys -name scheduler -exec grep . {} +
find: ‘/sys/kernel/debug’: Permission denied
find: ‘/sys/fs/pstore’: Permission denied
find: ‘/sys/fs/bpf’: Permission denied
/sys/devices/pci0000:00/0000:00:01.3/0000:02:00.1/ata5/host4/target4:0:0/4:0:0:0/block/sda/queue/scheduler:noop
deadline [cfq]
/sys/devices/pci0000:00/0000:00:01.1/0000:01:00.0/nvme/nvme0/nvme0n1/queue/scheduler:[none]
mq-deadline bfq
/sys/devices/pci0000:00/0000:00:07.1/0000:0c:00.3/usb4/4-3/4-3.4/4-3.4.1/4-3.4.1:1.0/host9/target9:0:0/9:0:0:0/block/sdb/queue/scheduler:noop
deadline [cfq]
$ uname -r
4.19.0-0.rc5.git3.1.fc30.x86_64
$ cat /boot/config-`uname -r` | grep -i bfq
CONFIG_IOSCHED_BFQ=m
CONFIG_BFQ_GROUP_IOSCHED=y
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Best Regards,
Mike Gavrilov.
