On Thu, Nov 22, 2018 at 06:26:17PM +0800, Ming Lei wrote:
> Suppose one bio includes (pg0, 0, 512) and (pg1, 512, 512):
> The split is introduced by the following code in blk_bio_segment_split():
>       if (bvprvp && bvec_gap_to_prev(q, bvprvp, bv.bv_offset))
>                       goto split;
> Without this patch, for non-cluster, the two bvecs are just in different
> segment, but still handled by one same bio. Now you convert into two bios.

Oh, true - we create new bios instead of new segments.  So I guess we
need to do something special here if we don't want to pay that overhead.

Or just look into killing the cluster setting..

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