[mvapich-discuss] Send Work Queue

[nilesh awate]

Hi all, 

I'm using mvapich2 1.0.1over ofed 1.2(udapl stack) 

In mvapich source code(udapl/rdma_udpl_prive.c) i've observed foll. thing

vc->mrail.send_wqes_avail[i] = rdma_default_max_wqe - 20;

rdma_defualt max_wqe which is 300 default

but if some provder have ep_attr.max_request_dtos = 16(for an example);  then we need to set

an env MV2_DEFAULT_MAX_WQE(which is not given in user guide) to 36(to get exaclty 16 ) as per the above code line

So please some one explain the significance subtracting "20" from default work queue size.

or is it reserving(20 slot) kind of thing  ? (if it is so then provider with 16 dtos will be in trouble)

Wating for reply

Nilesh.

 






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