[openib-general] basic IB doubt

[Sean Hefty]

>    Thomas> How does an adapter guarantee that no bridges or other
>    Thomas> intervening devices reorder their writes, or for that
>    Thomas> matter flush them to memory at all!?
>
>That's a good point.  The HCA would have to do a read to flush the
>posted writes, and I'm sure it's not doing that (since it would add
>horrible latency for no good reason).
>
>I guess it's not safe to rely on ordering of RDMA writes after all.

Couldn't the same point then be made that a CQ entry may come before the data
has been posted?

- Sean