# Re: \[PATCH rdma-next 09/15\] vfio/mlx5: Enable relaxed ordering on the live migration data mkey

- From: Jason Gunthorpe \<jgg@nvidia.com\>
- Date: 2026-08-11 19:32:18 
- List: netdev
- Page: https://ratatoskr.run/netdev/2026/08/17398566
- Thread: https://ratatoskr.run/linux-rdma/2026/07/17320154/t.md

```text
On Sun, 26 Jul 2026 12:29:23 +0300, Michael Gur [ref] wrote:
> As firmware guarantees that all device-issued data writes complete before
> posting of CQE, there is no need for strong ordering of memory accesses
> on the live migration data mkey.
> Enable relaxed ordering on the mkey via the mlx5_core RO setter.
> 
> This allows better performance and supporting vfio live migration on HW
> that restricts memory registration with strict ordering.
> 
> [...]

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>

-- 
Jason
```