Re: [PATCH] range-bw: Another I/O scheduling policy of dm-iobandsupporting the predicable I/O bandwidth (range bandwidth)

[Ryo Tsuruta]

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: 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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