User Manual
Table Of Contents
- Mellanox WinOF VPI User Manual
- Table of Contents
- List of Tables
- Document Revision History
- About this Manual
- 1 Introduction
- 2 Driver Features
- 3 Deploying Windows Server 2012 with SMB Direct
- 4 Driver Configuration
- 5 Performance Tuning
- 6 OpenSM - Subnet Manager
- 7 InfiniBand Fabric
- 7.1 Network Direct Interface
- 7.2 part_man - Virtual IPoIB Port Creation Utility
- 7.3 InfiniBand Fabric Diagnostic Utilities
- 7.4 InfiniBand Fabric Performance Utilities
- 7.4.1 ib_read_bw
- 7.4.2 ib_read_lat
- 7.4.3 ib_send_bw
- 7.4.4 ib_send_lat
- 7.4.5 ib_write_bw
- 7.4.6 ib_write_lat
- 7.4.7 ibv_read_bw
- 7.4.8 ibv_read_lat
- 7.4.9 ibv_send_bw
- 7.4.10 ibv_send_lat
- 7.4.11 ibv_write_bw
- 7.4.12 ibv_write_lat
- 7.4.13 ibaddr
- 7.4.14 ibcacheedit
- 7.4.15 iblinkinfo
- 7.4.16 ibqueryerrors
- 7.4.17 ibsysstat
- 7.4.18 perfquery
- 7.4.19 saquery
- 7.4.20 smpdump
- 8 Software Development Kit
- 9 Troubleshooting
- 10 Documentation
InfiniBand FabricRev 4.3
Mellanox Technologies
77
7.4.1.1 ib_read_bw Synopsys
7.4.1.2 ib_read_bw Options
The table below lists the various flags of the command.
7.4.2 ib_read_lat
ib_read_lat calculats the latency of RDMA read operation of message_sizeB between a pair of
machines. One acts as a server and the other as a client. They perform a ping pong benchmark on
which one side RDMA reads the memory of the other side only after the other side have read his
memory. Each of the sides samples the CPU clock each time they read the other side memory , in
order to calculate latency. Read is availible only in RC connection mode (as specified in IB spec).
ib_read_bw [-i(b_port) ib_port] [-m(tu) mtu_size] [-s(ize) message_size] [-n
iteration_num] [-p(ort) PDT_port] [-b(idirectional)] [-o(uts) outstanding reads] [-
a(ll)] [-V(ersion)]
Table 18 - ib_read_bw 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)
-o, --outs=<num> The number of outstanding read/atom(default 4)
-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)
-b, --bidirectional Measures bidirectional bandwidth (default unidirectional)
-V, --version Displays version number
-g, --grh Use GRH with packets (mandatory for RoCE)