[openib-general] basic IB doubt

[Woodruff, Robert J]

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