RE: [PATCH RFC 1/1] Add support for ZONE_DEVICE IO memory with struct pages.

Stephen Bates
2016-03-21T19:25:29Z

>
> There are fringe cases that are more complex, and maybe the correct reading
> of the spec is to setup routing to avoid optimal paths, but it certainly is
> possible to configure switches in a way that could not guarentee global
> ordering.
>
> Jason

If someone configures a multipath PCIe topology I think they will have potential for out of order RDMA reads/writes regardless of whether the target MR is in system memory of PCIe memory. So I don't think these crazy topologies are uniquely problematic for IOPMEM.

Stephen

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