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sockperf. On the first node, run <tt>sockperf sr -i IP --tcp</tt>. On the second, run <tt>sockperf pp -i SERVER_IP --tcp -m 4096</tt>. Decent average number is around 0.05-0.07ms.
<s>qperf. On the first node, just run <tt>qperf</tt>. On the second, <tt>qperf -vvs SERVER_IP tcp_lat -m 4096</tt>.</s> Don’t use qperf. It is super-stupid: it doesn’t disable Nagle (no TCP_NODELAY) and it doesn’t honor the <tt>-m 4096</tt> parameter — message size is always set to 1 BYTE in latency tests.
[[File:Warning icon.svg|32px|link=]] Warning: Ubuntu has AppArmor enabled by default and it affects network latency adversely. Disable it if you want good performance. The effect of AppArmor is like the following (Intel X520-DA2):
