Kernel Latency

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>

where:

• <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.