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    SubjectRe: [PATCH v4 01/11] block: make generic_make_request handle arbitrarily sized bios
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    On Wed, May 27, 2015 at 5:36 PM, Alasdair G Kergon <agk@redhat.com> wrote:
    > On Wed, May 27, 2015 at 04:42:44PM -0700, Ming Lin wrote:
    >> Here are fio results of XFS on a DM stripped target with 2 SSDs + 1 HDD.
    >> Does it make sense?
    >
    > To stripe across devices with different characteristics?
    >
    > Some suggestions.
    >
    > Prepare 3 kernels.
    > O - Old kernel.
    > M - Old kernel with merge_bvec_fn disabled.

    How to disable it?
    Maybe just hack it as below?

    void blk_queue_merge_bvec(struct request_queue *q, merge_bvec_fn *mbfn)
    {
    //q->merge_bvec_fn = mbfn;
    }

    > N - New kernel.


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