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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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