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    SubjectRe: [PATCH] fs-writeback: drop wb->list_lock during blk_finish_plug()
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    On Sun, Sep 13, 2015 at 4:12 PM, Dave Chinner <david@fromorbit.com> wrote:
    >
    > Really need to run these numbers on slower disks where block layer
    > merging makes a difference to performance.

    Yeah. We've seen plugging and io schedulers not make much difference
    for high-performance flash (although I think the people who argued
    that noop should generally be used for non-rotating media were wrong,
    I think - the elevator ends up still being critical to merging, and
    while merging isn't a life-or-death situation, it tends to still
    help).

    For rotating rust with nasty seek times, the plugging is likely to
    make the biggest difference.

    Linus


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