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    SubjectRe: [PATCH 02/20] blkio: Change CFQ to use CFS like queue time stamps
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    Hi Vivek,
    On Wed, Nov 4, 2009 at 12:43 AM, Vivek Goyal <vgoyal@redhat.com> wrote:
    > o Previously CFQ had one service tree where queues of all theree prio classes
    >  were being queued. One side affect of this time stamping approach is that
    >  now single tree approach might not work and we need to keep separate service
    >  trees for three prio classes.
    >
    Single service tree is no longer true in cfq for-2.6.33.
    Now we have a matrix of service trees, with first dimension being the
    priority class, and second dimension being the workload type
    (synchronous idle, synchronous no-idle, async).
    You can have a look at the series: http://lkml.org/lkml/2009/10/26/482 .
    It may have other interesting influences on your work, as the idle
    introduced at the end of the synchronous no-idle tree, that provides
    fairness also for seeky or high-think-time queues.

    Corrado
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