User Manual

InfiniBand FabricRev 4.3
Mellanox Technologies
87
perform a ping pong benchmark on which you send packet only after you receive one. Each of
the sides samples the CPU clock each time they receive a send packet, in order to calculate the
latency.
7.4.10.1 ibv_send_lat Synopsys
7.4.10.2 ibv_send_lat Options
The table below lists the various flags of the command.
ibv_send_lat [-i(b_port) ib_port] [-c(onnection_type) RC\UC\UD] [-d ib_device name]
[-m(tu) mtu_size] [-s(ize) message_size] [-t(x-depth) tx_size] [-
I(nline_size) inline size] [-u qp timeout] [-S(L) sl
type] [-x gid index] [-e(events) use events] [-n
iteration_num] [-g num of qps in mcast
group] [-p(ort) PDT_port] [-a(ll)] [-V(ersion)] [-C report
cycles] [-H report histogram] [-U report unsorted] [-F
CPU freq fail]
Table 27 - ibv_send_lat Flags and Options
Flag Description
-p, --port=<port> Listens on/connect to port <port> (default 18515)
-d, --ib-dev=<dev> Uses IB device <device guid> (default first device found)
-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)
-C, --report-cycles Reports times in cpu cycle units (default microseconds)
-H, --report-histogram Print out all results (default print summary only)
-U, --report-unsorted (implies -
H)
Print out unsorted results (default sorted)
-V, --version Displays version number
-F, --CPU-freq The CPU frequency test. It is active even if the cpufreq_ondemand
module is loaded