---
name: "udpong"
section: "1"
platform: "linux"
package: "rdma-core"
version: "65.0-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/udpong"
---

# udpong(1)

unreliable datagram streaming over RDMA ping-pong test.

## NAME

udpong - unreliable datagram streaming over RDMA ping-pong test.

## SYNOPSIS

```
udpong [-s server_address] [-b bind_address]
			[-B buffer_size] [-C transfer_count]
			[-S transfer_size] [-p server_port] [-T test_option]
```

## DESCRIPTION

Uses unreliable datagram streaming over RDMA protocol (rsocket) to connect and exchange data between a client and server application.

## OPTIONS

- \-s server\_address

  The network name or IP address of the server system listening for connections.  The used name or address must route over an RDMA device. This option must be specified by the client.

- \-b bind\_address

  The local network address to bind to.

- \-B buffer\_size

  Indicates the size of the send and receive network buffers.

- \-C transfer\_count

  The number of messages to transfer from the client to the server and back again on each iteration.  (default 1000)

- \-S transfer\_size

  The size of each send transfer, in bytes.  (default 1000)

- \-p server\_port

  The server's port number.

- \-T test\_option

  Specifies test parameters.  Available options are:

s \| socket  - uses standard socket calls to transfer data

a \| async - uses asynchronous operation (e.g. select / poll)

b \| blocking - uses blocking calls

n \| nonblocking - uses non-blocking calls

e \| echo - server echoes all messages

## NOTES

Basic usage is to start udpong on a server system, then run udpong -s server\_name on a client system.  udpong will run a series of latency and bandwidth performance tests. Specifying a different transfer\_count or transfer\_size will run a user customized test using default values where none have been specified.

Because this test maps RDMA resources to userspace, users must ensure that they have available system resources and permissions.  See the libibverbs README file for additional details.

## SEE ALSO

[rdma\_cm(7)](/rdma_cm/7.md)