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    SubjectRe: [PATCH 1/2] cfq: always return false from should_idle if slice_idle is set to zero
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    Jens Axboe <axboe@kernel.dk> writes:

    > On 21/06/10 21.49, Jeff Moyer wrote:
    >> Hi,
    >>
    >> In testing a competing fsync-ing process and a sequential reader on
    >> mid-grade storage, I found that cfq was incapable of achieving the I/O
    >> rates of deadline, no matter how it was tuned. Investigation, and insight
    >> from Vivek (mostly the latter), led to identifying that we were still
    >> idling for the last queue in the service tree.
    >>
    >> Modifying cfq_should_idle to not idle when slice_idle is set to zero got
    >> us much closer to the performance of deadline for this workload. I have
    >> one follow-on patch that gets us on-par with deadline, but I think this
    >> patch stands alone.
    >>
    >> Comments, as always, are appreciated.
    >
    > This looks good.

    So.... applied to which branch?

    Thanks!
    Jeff


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