User Manual

Rev 2.2-1.0.1
Mellanox Technologies
277
Rate Limiter
The table below lists the Rate Limiter flags of the command
Table 50 - Additional Rate Limiter Flags and Options
Flag Description
--burst_size=<size> Set the amount of messages to send in a burst when using
rate limiter
--rate_limit=<rate[pps]> Set the maximum rate of sent packages
--rate_units=<units> [Mgp] Set the units for rate limit to MBps (M), Gbps (g) or pps
(p)
.
9.5.4 ib_send_lat
ib_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. They perform a ping pong benchmark on
which you send packet only if you receive one. Each of the sides samples the CPU each time they
receive a packet in order to calculate the latency. Using the "-a" provides results for all message
sizes.
Synopsis
Server
ib_send_lat [options]
Client
ib_send_lat [options] <hostname>
Options
The table below lists the various flags of the command.
Table 51 - ib_send_lat Flags and Options
Flag Description
-a, --all Run sizes from 2 till 2^23
-c, --connection=<RC/XRC/UC/
UD/DC>
Connection type RC/XRC/UC/UD/DC (default RC)
-C, --report-cycles Report times in cpu cycle units (default microseconds)
-d, --ib-dev=<dev> Use IB device <dev> (default first device found)
-D, --duration Run test for a customized period of seconds.
-e, --events Sleep on CQ events (default poll)
-f, --margin Measure results within margins. (default=2sec)