Hi Dong-Jae, From: Dong-Jae Kang <baramsori72@xxxxxxxxx> Subject: Re: [PATCH] range-bw: Another I/O scheduling policy of dm-ioband supporting the predicable I/O bandwidth (range bandwidth) Date: Thu, 30 Apr 2009 14:15:24 +0900 > Hi Ryo > > I am sorry for delayed reply. > I tested range-bw policy as you send me your configuration > and I found some logical bugs in range-bw including big scheduling overhead. > > > I used fio 1.22. The below is a script which I actually ran. > > > > #!/bin/sh > > dev1=/dev/sdb4 # SATA disk > > echo "0 $(sudo blockdev --getsize $dev1) ioband $dev1 share2 0 0 > > cgroup range-bw 0" | sudo dmsetup create ioband1 > > > > arg="--time_based --runtime=10 --ioengine=libaio --iodepth=50 \ > > --direct=1 --norandommap" > > > > dmsetup message ioband1 0 attach 2 > > dmsetup message ioband1 0 attach 3 > > dmsetup message ioband1 0 min-bw 2:100 > > dmsetup message ioband1 0 max-bw 2:100 > > dmsetup message ioband1 0 min-bw 3:200 > > dmsetup message ioband1 0 max-bw 3:200 > > I recommend it is better to use different value in min-bw and max-bw > because its concept is to support range-bw with the minimum > guaranteeing and maximum limitation. > exampe - min-bw : 1024 / max-bw : 3072 > > > echo $$ > /cgroup/grp1/tasks > > fio $arg --rw=randread --name=grp1 --filename=/dev/mapper/ioband1 \ > > --output=r2-1.log & > > echo $$ > /cgroup/grp2/tasks > > fio $arg --rw=randread --name=grp2 --filename=/dev/mapper/ioband1 \ > > --output=r2-2.log & > > wait > > > > Please feel free to ask me if you need more information. > > > > > > I'm look forward to seeing the results. > > > Thanks for your comments. > And I will fix the bugs and re-release it after several days > at that time, I inform you about that. > > Ryo, > now, I am using bio-cgroup..... > but, Is there additional things I have to consider to support AIO or > dealyed I/O? bio-cgroup is renamed to bklio-cgroup. :) I don't clearly understand about range-bw but I think that you don't need to consider to support them and it should be taken care of by blkio-cgroup and the common part of dm-ioband, not the policy implementation. Do you have any problems with AIO or delayed write? > > -- > Best Regards, > Dong-Jae Kang _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/containers
