[openib-general] Re: [PATCH][16/26] IB/mthca: mem-free doorbell record writing

[Roland Dreier]

    Michael> Its not necessarily related to reads. writes must arrive
    Michael> in order, even if the card is not reading at that time.

We're talking about doorbell records in host memory, not MMIO doorbell
writes.  So there's no way for the HCA to know that host memory was
written out of order unless it happens to read in the middle.

 - R.