Kernel Latency

Onload User Guide (UG1586)

Document ID
Release Date
1.2 English

The benchmark performance tests can be run without Onload using the regular kernel network drivers. To do this remove the onload --profile=… part from the command line.

Run the sfnt-pingpong application on both systems:

[sys-1]# taskset -c 1 sfnt-pingpong
[sys-2]# taskset -c 1 sfnt-pingpong --affinity "1;1" \
    <connect> <protocol> <sys-1_ip>


  • <connect> is --connect only for UDP, to use connect()
  • <protocol> is udp or tcp, as appropriate
  • <sys-1_ip> is the IP address of sys-1.

The output identifies mean, minimum, median and maximum (nanosecond) ½ RTT latency for increasing packet sizes, including the 99% percentile and standard deviation for these results.