[ofa-general] completion order of RDMA write?

[Ralph Campbell]

On Mon, 2008-02-04 at 18:51 -0600, Yicheng Jia wrote:
> 
> Hi Folks, 
> 
> I have a question regarding to the completion order of RDMA write.
> Since RDMA write without Immediate is not handled by responder's RQ
> WQEs, if two or more HCAs write to a single HCA simultaneously with
> this operation, what the completion order of these RDMA writes would
> be? 
> 
> Thanks! 
> Yicheng

There are no ordering guarantees.  Two senders can interleave packets at
the receiver in any order. If the two RDMA write ranges overlap and are
larger than the path MTU, the resulting memory contents might have
parts of each RDMA write. The RDMA with or without immediate doesn't
matter.