On 5/17/2011 10:53 PM, i...@celticblues.com wrote:
Ok. Thanks for the information.
Is there any particular advantage of using CM over TCP for this information
(LID or GID, Qp num, PSN, RKey and the address of the writing buffer)?
Is ib_write_bw an example of RDMA write / RD?
E
Except of the iWarp support Steve mentioned I think the rdma_cm has an
advantage because it does not required an additional Ethernet connection
to the machines. the test has all it's need.
ib_write_bw is an excellent example of RDMA write with a lot of feature. it can
run on RC and UC (no RD).
If you want to view a code of RDMA write, look at ib_write_bw.
Ido
Quoting Ido Shamai <i...@dev.mellanox.co.il>:
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
On 5/17/2011 10:19 PM, i...@celticblues.com 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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