I want to control bandwidth ratio of 2 fio processes by io.bfq.weight,but the result was not what I wanted.
(kernel-4.18.0-372.9.1.el8.x86_64, and use cgroup v2)

1 fio simultaneously got :1.5GB/s
1 fio simultaneously got:767MB/s + 773MB/s
Wanted: 500MB/s + 1000MB/s
Why?Wrong understanding or wrong use?

####my test shell is:

mount /dev/sda1 /test/data2/
echo bfq > /sys/block/sda/queue/scheduler
echo 0 > /sys/block/sda/queue/iosched/low_latency

cd /sys/fs/cgroup/
mkdir fio1 fio2
echo "+io +memory" > cgroup.subtree_control

echo 50 > fio1/io.bfq.weight
echo 100 > fio2/io.bfq.weight

echo $$ > fio1/cgroup.procs
fio -rw=write -ioengine=libaio -bs=4k -size=3G -numjobs=8 -iodepth 8 -thread -name=/test/data2/fio_test1.log

do follow at another terminal

echo $$ > /sys/fs/cgroup/fio2/cgroup.procs
fio -rw=write -ioengine=libaio -bs=4k -size=3G -numjobs=8 -iodepth 8 -thread -name=/test/data2/fio_test2.log