On Wed, May 27, 2015 at 01:40:22AM +0100, Alasdair G Kergon wrote:
> It does sometimes make a significant difference to device-mapper stacks.
> DM only uses it for performance reasons - it can already split bios when
> it needs to. I tried to remove merge_bvec_fn from DM several years ago but
> co
On Wed, May 27, 2015 at 09:06:40AM +1000, Neil Brown wrote:
> Because we don't know what the "right" size is. And the "right" size can
> change when array reconfiguration happens.
In certain configurations today, device-mapper does report back a sensible
maximum bio size smaller than would other
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