[openib-general] DAPL and local_iov in RDMA RR/RW mode

[Ryszard Jurga]

Hi everybody,

I have one question about a number of segments in local_iov when using RDMA Write and Read mode. Is it possible to have num_segments>1? I am asking, because  when I try to set up num_segments to a value > 1, then I can still only read/write one segment, even though I have an appropriate remote buffer already reserved. The size of transfered buffer is 10bytes, num_segs=2. The information, which is printed below, was obrained from  network devices with one remark - I have set up manualy max_rdma_read_iov=10 and max_rdma_write_iov=10. Thank you in advance for your help.  

Best regards,
Ryszard. 


EP_ATTR: the same for both nodes:
----------------------------------
 max_message_size=2147483648
 max_rdma_size=2147483648
 max_recv_dtos=16
 max_request_dtos=16
 max_recv_iov=4
 max_request_iov=4
 max_rdma_read_in=4
 max_rdma_read_out=4
 srq_soft_hw=0
 max_rdma_read_iov=10
 max_rdma_write_iov=10
 ep_transport_specific_count=0
 ep_provider_specific_count=0
----------------------------------



IA_ATTR: different for nodes
----------------------------------
IA Info:
 max_eps=64512
 max_dto_per_ep=65535
 max_rdma_read_per_ep_in=4
 max_rdma_read_per_ep_out=1610616831
 max_evds=65408
 max_evd_qlen=131071
 max_iov_segments_per_dto=28
 max_lmrs=131056
 max_lmr_block_size=18446744073709551615
 max_pzs=32768
 max_message_size=2147483648
 max_rdma_size=2147483648
 max_rmrs=0
 max_srqs=0
  max_ep_per_srq=0
 max_recv_per_srq=143263
 max_iov_segments_per_rdma_read=1073741824
 max_iov_segments_per_rdma_write=0
 max_rdma_read_in=0
 max_rdma_read_out=65535
 max_rdma_read_per_ep_in_guaranteed=7286
 max_rdma_read_per_ep_out_guaranteed=0


IA Info:
 max_eps=64512
 max_dto_per_ep=65535
 max_rdma_read_per_ep_in=4
 max_rdma_read_per_ep_out=0
 max_evds=65408
 max_evd_qlen=131071
 max_iov_segments_per_dto=28
 max_lmrs=131056
 max_lmr_block_size=18446744073709551615
 max_pzs=32768
 max_message_size=2147483648
 max_rdma_size=2147483648
 max_rmrs=0
 max_srqs=0
 max_ep_per_srq=0
 max_recv_per_srq=142247
 max_iov_segments_per_rdma_read=1073741824
 max_iov_segments_per_rdma_write=0
 max_rdma_read_in=0
 max_rdma_read_out=65535
 max_rdma_read_per_ep_in_guaranteed=7286
 max_rdma_read_per_ep_out_guaranteed=28
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