Bug report: ref tag error while running IO > MDTS on nvme device

[Max Gurtovoy]

On 10/3/2017 5:25 PM, Keith Busch wrote:
> Hi Max,

Hi Keith,

> 
> Is this behavior new, or was this always broken?

Good question.
Haven't tried older kernels (only 4.13.0).

> 
> Since you mention MDTS, I wonder if this device is counting the separate
> metadata as part of the transfer and doing the wrong thing as a result?
> We're only supposed to count the metadata size in consideration of MDTS
> if metadata is interleaved.

mdts is 5 (max_hw_sectors_kb is 128) so I guess it's ok from device 
point of view.