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    SubjectRe: [PATCH 14/16] blkio: Idle on a group for some time on rotational media
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    Hi Vivek,
    On Fri, Nov 13, 2009 at 12:32 AM, Vivek Goyal <vgoyal@redhat.com> wrote:
    > o If a group is not continuously backlogged, then it will be deleted from
    >  service tree and loose it share. For example, if a single random seeky
    >  reader or a single sequential reader is running in group.
    >
    Without groups, a single sequential reader would already have its 10ms
    idle slice, and a single random reader on the noidle service tree
    would have its 2ms idle, before switching to a new workload. Were
    those removed in the previous patches (and this patches re-enable
    them), or this introduces an additional idle between groups?

    > o One solution is to let group loose it share if it is not backlogged and
    >  other solution is to wait a bit for the slow group so that it can get its
    >  time slice. This patch implements waiting for a group to wait a bit.
    >
    > o This waiting is disabled for NCQ SSDs.
    >
    > o This patch also intorduces the tunable "group_idle" which can enable/disable
    >  group idling manually.
    >
    > Signed-off-by: Vivek Goyal <vgoyal@redhat.com>

    Thanks,
    Corrado
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