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

    2009/4/24 Ryo Tsuruta <>:
    > Hi Dong-Jae,
    >> range-bw is based on newest version of dm-ioband, bio-cgroup V7(4
    >> patch files), dm-ioband-V1.10.3(1 patch file) and these can be
    >> referred in
    >> and the below range-bw patch file(dm-ioband-rangebw-1.10.3.patch)
    >> including Ryo’s patch set is also referred in:
    >> You have to apply this(dm-ioband-rangebw-1.10.3.patch) patch file
    >> after applying dm-ioband and bio-cgroup patches.
    >> The released range-bw may have some problems and improper code
    >> although I try to test heavily. It is first release ^^
    >> And it is required to reduce the overhead of I/O scheduling and to
    >> optimize the source code.
    >> Any comments or advices is welcome
    >> Ryo Tsuruta, Can you check this patch file ?
    >> for convenience, patch file is attached in this mail.
    > I took a quick look at your patch. It seems to be no problem for
    > existing dm-ioband code, but I would suggest you that you had better
    > use to check for your coding style.
    > The patch could be applied and compiled successfully. I did a simple
    > test, running fio on each cgroup in 30 seconds simultaneously, and got
    > the following results.
    >               w/o range-bw     w/ range-bw (min&max-bw settings)
    > cgroup1          331KB/s             102KB/s (100KB)
    > cgroup2          331KB/s             196KB/s (200KB)
    > Do you have any benchmark resutls? I'd be very interested to see it.
    > Thanks,
    > Ryo Tsuruta

    Thank you for your comments about range-bw
    and your recommendation of seems to be useful for me.

    I wonder your test configuration and environment.
    Your result is some strange for me, because I didn't use the testing tool, fio.
    I have used xdd, bonnie++ and tiobench during the test.

    So, I will try to evaluate range-bw using fio, to do that, I need to
    know your configuration and basic environment in briefly
    if it don't bother you, can you give me the information?

    and I attached the result of basic evaluation of range-bw using xdd
    6.5.(Test Result for range-bw_english.pdf)
    it was performed to evaluate the basic functionalities in one process per group.

    actually, more evaluation is need in specfic envinronment like as
    massive I/O by huge processes in each group.
    and it is going on now
    Best Regards,
    Dong-Jae Kang
    [unhandled content-type:application/pdf]
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