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    SubjectRe: [RFC PATCH 1/2] block: strict rq_affinity
    On 2011-07-23 03:46, Christoph Hellwig wrote:
    > On Fri, Jul 22, 2011 at 01:59:39PM -0700, Dan Williams wrote:
    >> Some storage controllers benefit from completions always being steered
    >> to the strict requester cpu rather than the looser "per-socket" steering
    >> that blk_cpu_to_group() attempts by default.
    >
    > Isn't this actually dependent on the cpu, and not the storage
    > controller?

    It is, it's completely indendent of the controller used. Perhaps some
    drivers could have a very heavy end io completion handling causing the
    problem to become larger, but in general it's an artifact of the CPU and
    not the controller.

    --
    Jens Axboe



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