Re: perftest question

[Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>]

On 05/17/2011 02:41 PM, Ido Shamai wrote:
> Those are actually the same tests, from an IB point of view.
>
> the difference between them is that ib_write_bw passes the arguments that need to be known to other side ( LID or GID, 
> Qp num, PSN, RKey and the address of the writing buffer) before post_sending,
>
> through TCP connection (using sockets) and the rdma_bw uses the rdma_cm module , which sends those arguments through 
> the IB wire and the SM.
>
> rdma_cm is not updated with all the features ib_write_bw have. I will work on this test shortly
>
> Ido
>

In addition, rdma_bw and rdma_lat work over iWARP when used with the --cma option.  The ib_* versions do not since they 
don't have a option to use the rdma_cm, which is required for setting up iWARP connections.

Steve.


>
> On 5/17/2011 10:19 PM, ib-x2spCj9RiN0z5UmgcLIfJQ@public.gmane.org wrote:
>> Just downloaded a snapshot of the perftests.  In the README under "Test Descriptions" it says:
>>
>> rdma_bw.c     streaming BW test with RDMA write transactions
>>
>> and
>>
>> write_bw.c     BW test with RDMA write transactions
>>
>> What is the difference between rdma_bw and write_bw?  I see that the rdma_bw description contains "streaming" where 
>> as write_bw description does not...  but I am not sure I understand what that means?
>>
>> E
>>
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