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    SubjectRe: [PATCH 0/3]CFQ: add think time check for service tree and group
    From
    2011/7/4 Shaohua Li <shaohua.li@intel.com>:
    > Hi,
    >  Currently when the last queue of a service tree/group is empty, CFQ
    > doesn't expire the queue. This is to allow requests from the tree/group
    > come soon, so tree/group doesn't miss its share. But if the think time
    > is big, the assumption isn't correct. idling the queue is just wasting
    > bandwidth.
    >
    > Originally I was hoping this can resolve Vivek's fsync issue, but it
    > doesn't. The fsync issue is caused by queue idling. But since think time
    > check only helps for think time above default queue idle time (8ms),
    > think time check doesn't help.
    >
    > On the other hand, think time check is still helpful for queues with
    > think time. I had test case in follow patches show throughput
    > improvement without sacrifice tree/group shares.
    >
    Jens,
    can you look at the patches? I refreshed some patches in replying
    Vivek, I can resend if required.

    Thanks,
    Shaohua
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