TCPDirect Latency - UG1586

Onload User Guide (UG1586)
Document ID
UG1586
Release Date
2025-11-03
Revision
1.31 English

TCPDirect test applications can be found in:

/usr/share/doc/tcpdirect/examples/zf_apps

Run the zfudppingpong application on both systems:

[sys-1]# ZF_ATTR="interface=<interface>;ctpio_mode=ct" taskset -c 1 \
   zfudppingpong -s <payload> pong <sys-1_ip>:20000 <sys-2_ip>:20000
[sys-2]# ZF_ATTR="interface=<interface>;ctpio_mode=ct" taskset -c 1 \
   zfudppingpong -s <payload> ping <sys-2_ip>:20000 <sys-1_ip>:20000

or run the zftcppingpong application on both systems:

[sys-1]# ZF_ATTR="interface=<interface>;ctpio_mode=ct" taskset -c 1 \
   zftcppingpong -s <payload> pong <sys-1_ip>:20000
[sys-2]# ZF_ATTR="interface=<interface>;ctpio_mode=ct" taskset -c 1 \
   zftcppingpong -s <payload> ping <sys-1_ip>:20000

where:

  • <interface> is the interface to use
  • <payload> is the payload size, in bytes
  • <sys-1_ip> is the IP address of sys-1
  • <sys-2_ip> is the IP address of sys-2.

The output identifies mean RTT, which is halved to give the mean ½ RTT latency.