[openib-general] Reuse pd amd mr

[Tang, Changqing]

>
>No, a PD belongs to a specific device.  However nothing 
>prevents you from creating one PD for each device, and two MRs 
>(one for each device, each using one of those two PDs) that 
>cover the same memory.

Roland:
	I did exactly what you said with two cards on a node, however,
if I use the two physical channels for 
Message striping, 99% of the test passed, but for some condition, I got
IBV_WC_RETRY_EXC_ERR, or the code
Just hangs there with no sending completion(ibv_poll_cq returns 0). Do
you think this is a firware issue,
Or the driver issue ?

	Thanks.

--CQ


>
> - R.
>
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