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    SubjectRe: [PATCH v4 01/11] block: make generic_make_request handle arbitrarily sized bios
    On Fri, May 29 2015 at  3:05P -0400,
    Ming Lin <mlin@kernel.org> wrote:

    > 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;
    > }

    Right, there isn't an existing way to disable it, you'd need a hack like
    that.


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