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    SubjectRe: [dm-devel] Re: dm-ioband: Test results.
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    Hi Vivek,

    > > I could see the priority inversion by running Vivek's script and I
    > > understand how RT requests has to be handled. I'll create a patch
    > > which makes dm-ioband cooperates with CFQ scheduler. However, do you
    > > think we need some kind of limitation on processes which belong to the
    > > RT class to prevent the processes from depleting bandwidth?
    >
    > I think to begin with, we can keep the same behavior as CFQ. An RT task
    > can starve other tasks.
    >
    > But we should provide two configurations and user can choose any one.
    > If RT task is in root group, it will starve other sibling tasks/groups. If
    > it is with-in a cgroup, then it will starve its sibling only with-in that
    > cgroup and will not impact other cgroups.
    >
    > What I mean is following.
    >
    > root
    > / \
    > RT group1
    >
    > In above configuration RT task will starve everybody else.
    >
    > root
    > / \
    > group1 group2
    > / \
    > RT BE
    >
    > In above configuration RT task will starve only sibling in group1 but
    > will not starve the tasks in group2 or in root.

    Thanks for the suggestion. I'll try this way when dm-ioband supports
    hierarchical grouping.

    Thanks,
    Ryo Tsuruta


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