[ofa-general] Re: high latency results with qperf

Or Gerlitz ogerlitz at voltaire.com
Thu Jun 11 03:18:42 PDT 2009


to make it more a-2-a I also tested with ib_send_lat and qperf's
rc_rdma_read_lat, same story.

# ib_send_lat h2 -s 4
------------------------------------------------------------------
                    Send Latency Test
Inline data is used up to 400 bytes message
Connection type : RC
   local address: LID 0x04 QPN 0x18004d PSN 0x42dd33
  remote address: LID 0x01 QPN 0x7a004b PSN 0x1aa1ed
Mtu : 2048
------------------------------------------------------------------
 #bytes #iterations    t_min[usec]    t_max[usec]  t_typical[usec]
      4        1000           1.62          25.29             1.67
------------------------------------------------------------------

# qperf h2 -m 4 -t 20 rc_rdma_write_lat
rc_rdma_write_lat:
    latency  =  10.2 us




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