---
name: "ib_write_bw_postlist"
section: "1"
platform: "linux"
package: "perftest"
version: "1.2-OFED-1.4.2-2"
release: "Debian 7 (Wheezy)"
platforms: ["linux"]
url: "https://new.carta.tech/ib_write_bw_postlist"
---

# ib\_write\_bw\_postlist(1)

RDMA write post list bandwidth test

## NAME

ib\_write\_bw\_postlist - RDMA write post list bandwidth test

## SYNOPSIS

**ib\_write\_bw\_postlist \[** *options* **\] \[** *server IP address* **\]**

## DESCRIPTION

This program tests the bandwidth of RMDA write transactions.

## OPTIONS

- **-p, --port=\<port\>**

  listen on/connect to port \<port\> (default 18515)

- **-d, --ib-dev=\<dev\>**

  use IB device \<dev\> (default first device found)

- **-i, --ib-port=\<port\>**

  use port \<port\> of IB device (default 1)

- **-c, --connection=\<RC/UC\>**

  connection type RC/UC (default RC)

- **-m, --mtu=\<mtu\>**

  mtu size (256 - 4096. default for hermon is 2048)

- **-g, --post=\<num of posts\>**

  number of posts for each qp in the chain (default tx\_depth)

- **-q, --qp=\<num of qp's\>**

  Num of qp's(default 1)

- **-s, --size=\<size\>**

  size of message to exchange (default 65536)

- **-a, --all**

  Run sizes from 2 till 2^23

- **-t, --tx-depth=\<dep\>**

  size of tx queue (default 100)

- **-n, --iters=\<iters\>**

  number of exchanges (at least 2, default 5000)

- **-I, --inline\_size=\<size\>**

  max size of message to be sent in inline mode (default 400)

- **-b, --bidirectional**

  measure bidirectional bandwidth (default unidirectional)

- **-V, --version**

  display version number

- **-F, --CPU-freq**

  do not fail even if cpufreq\_ondemand module is loaded

## AUTHOR

- Guy Coates \< gmpc@sanger.ac.uk \>