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    SubjectRe: [PATCH 3/4] blk-mq: implement hybrid poll mode for sync O_DIRECT
    On Tue, Nov 01, 2016 at 03:05:24PM -0600, Jens Axboe wrote:
    > This patch enables a hybrid polling mode. Instead of polling after IO
    > submission, we can induce an artificial delay, and then poll after that.
    > For example, if the IO is presumed to complete in 8 usecs from now, we
    > can sleep for 4 usecs, wake up, and then do our polling. This still puts
    > a sleep/wakeup cycle in the IO path, but instead of the wakeup happening
    > after the IO has completed, it'll happen before. With this hybrid
    > scheme, we can achieve big latency reductions while still using the same
    > (or less) amount of CPU.
    >
    > Signed-off-by: Jens Axboe <axboe@fb.com>

    This looks very nice. I'll need to run some tests before giving the
    formal ACK, though.

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