FM / 7:0

/sys/devices/virtual/bdi/7:0

Name	Size	Mode	Actions
power/	-	0755	rm
subsystem/	-	0755	rm
max_ratio	4096	0644	edit dl rm
min_ratio	4096	0644	edit dl rm
read_ahead_kb	4096	0644	edit dl rm
stable_pages_required	4096	0444	edit dl rm
uevent	4096	0644	edit dl rm

Edit: /sys/devices/virtual/bdi/7:0/min_ratio (4096B)

cmd: