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    SubjectRe: [PATCH] range-bw: Another I/O scheduling policy of dm-ioband supporting the predicable I/O bandwidth (range bandwidth)
    From
    Hi Dong-Jae

    From: Dong-Jae Kang <baramsori72@gmail.com>
    Subject: Re: [PATCH] range-bw: Another I/O scheduling policy of dm-ioband supporting the predicable I/O bandwidth (range bandwidth)
    Date: Mon, 4 May 2009 20:23:04 +0900

    > Hi, Ryo
    >
    > I released bug-fixed range-bw(V1) controller several minutes ago
    >
    > Although several WARNINGs of checkpatch are remained,
    > but patch file was strictly checked by checkpatch.pl
    > It was very time-consuming job :)
    > Thank you for your advice
    >
    > >>
    > >> > 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
    >
    > after bug-fix,I evaluated range-bw according to your configuration and
    > test environment
    > the result is in new relesed range-bw mail, [PATCH 0/2]
    > and more detailed documentation is also available and it can be
    > referred in [PATCH 1/2]
    >
    > Ryo,
    > can you check the result ?

    O.K. I'll check it and report back to you.

    >
    > > 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?
    >
    > if you are interested in range-bw, more information is available to you
    > and any questions and comments about range-bw is always welcom. :)
    >
    > Ryo,
    > blkio-cgroup can be applied to dm-ioband ver1.10.3 without modification?
    > I didn't check blkio-cgroup yet.

    Yes, it can. Please try it.

    Thanks,
    Ryo Tsuruta
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