User Manual

Rev 4.60
Mellanox Technologies
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8.4.10 ibv_send_lat
This is a more advanced version of ib_send_lat and contains more flags and features than the
older version and also improved algorithms. ibv_send_lat calculates the latency of sending a
packet in message_size between a pair of machines. One acts as a server and the other as a client.
-i, --ib-port=<port> Uses port <port> of IB device (default 1)
-m, --mtu=<mtu> The mtu size (default 1024)
-c, --connection=<RC/UC/UD> Connection type RC/UC/UD (default RC)
-s, --size=<size> The size of message to exchange (default 65536)
-a, --all Runs sizes from 2 till 2^23
-t, --tx-depth=<dep> The size of tx queue (default 100)
-n, --iters=<iters> The number of exchanges (at least 2, default 1000)
-u, --qp-timeout=<timeout> QP timeout. The timeout value is 4 usec * 2 ^(timeout), default 14
-S, --sl=<sl> The service level (default 0)
-x, --gid-index=<index> Test uses GID with GID index taken from command line (for
RDMAoE index should be 0)
-b, --bidirectional Measures bidirectional bandwidth (default unidirectional)
-V, --version Displays version number
-g, --post=<num of posts> The number of posts for each qp in the chain (default tx_depth)
-e, --events Inactive during CQ events (default poll)
-F, --CPU-freq The CPU frequency test. It is active even if the cpufreq_ondemand
module is loaded
-r, --rx-depth=<dep> Makes rx queue bigger than tx (default 600)
-I, --inline_size=<size> The maximum size of message to be sent in “inline mode” (default 0)
-N, --no peak-bw Cancels peak-bw calculation (default with peak-bw)
-g, --mcg=<num_of_qps> Sends messages to multicast group with <num_of_qps> qps attached
to it.
-M, --MGID=<multicast_gid> In case of multicast, uses <multicast_gid> as the group MGID.
The format must be '255:1:X:X:X:X:X:X:X:X:X:X:X:X:X:X', where
X is a value within [0,255]
-R, --rdma_cm Connects QPs with rdma_cm and run test on those QPs
-z, --com_rdma_cm Communicates with rdma_cm module to exchange data - use regular
QPs
-Q, --cq-mod Generates Cqe only after <--cq-mod> completion
Table 40 - ibv_send_bw Flags and Options
Flag Description