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    SubjectRe: [PATCH v3 1/2] qspinlock: Introducing a 4-byte queue spinlock implementation
    On 01/28/2014 01:19 PM, Waiman Long wrote:
    > This patch introduces a new queue spinlock implementation that can
    > serve as an alternative to the default ticket spinlock. Compared with
    > the ticket spinlock, this queue spinlock should be almost as fair as
    > the ticket spinlock. It has about the same speed in single-thread and
    > it can be much faster in high contention situations. Only in light to
    > moderate contention where the average queue depth is around 1-2 will
    > this queue spinlock be potentially a bit slower due to the higher
    > slowpath overhead.
    >
    > This queue spinlock is especially suit to NUMA machines with a large
    > number of cores as the chance of spinlock contention is much higher
    > in those machines. The cost of contention is also higher because of
    > slower inter-node memory traffic.

    >
    > Signed-off-by: Waiman Long <Waiman.Long@hp.com>

    Acked-by: Rik van Riel <riel@redhat.com>



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