Messages in this thread | | | Date | Fri, 29 May 2015 00:05:27 -0700 | Subject | Re: [PATCH v4 01/11] block: make generic_make_request handle arbitrarily sized bios | From | Ming Lin <> |
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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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