TCPDirect Latency

TCPDirect is a feature available for the SFN8000, X2 series and X3 series adapters. SFN8000 and X2 series adapters must have Onload and TCPDirect activation keys installed.

TCPDirect test applications can be found in:

onload-<version>/build/gnu_x86_64/tests/zf_apps/static

Run the zfudppingpong application on both systems:

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

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

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

where:

• <interface> is the interface to use
• <mode> is the CTPIO mode to use, which is ct for 10 Gb, or sf for 25 Gb
• <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.