[openib-general] basic IB doubt

[Caitlin Bestler]

Woodruff, Robert J wrote:
> Catlin wrote,
> 
>> For iWARP there are network performance reasons why in-order memory
>> writes will never be guaranteed.
> 
> For iWarp, or any other RDMA over Ethernet protocol, the
> behavior is not to guarantee all packets are written
> in-order, just that the last byte of the last packet is
> written last. This can easily be implemented in an iWarp card
> or by the driver with minimal performance impact in most cases.
> 
> So for example, if the last packet arrives before all the
> other packets have arrived, the iWarp card or driver does not
> place that data of the last packet until all the other
> packets have arrived.
> 
> woody

Fascinating argument. The correct forum for that is the IETF
RDDP Workgroup, not a Linux open source project.