[mvapich-discuss] Suppressing send work request completions in RNDV RDMA_WRITE

[Pagadala Jagadeesh]

Hi all,

I am trying to understand RNDV protocol in MVAPICH2-1.9 with respect to
RDMA_WRITE operation.
For data size of more than 4MB, each RDMA_WRITE request carries 4M
data and all such send work requests are generating completion entry.
In InfiniBand there is a mechanism to suppress send completion entries(
MVAPICH2-1.9 is enabling this feature when creating a QP using attr.sq_sig_all =
0,
But not using send completion suppression while posting send work request).
In case of RDMA_WRITE (RNDV) we can suppress intermediate send completions,
when last send request completion is generated then we can make sure that
previous send work requests are also completed successfully.

Is there any overhead of suppressing such intermediate send completions?

Thanks & Regards
Jagadeesh
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