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* Don't use `rados bench`. It creates a small number of objects (1-2 for a thread) so all of them always reside in cache and improve the results far beyond they should be.
* You can use `rbd bench`, but fio is better.
=== Test your network ===
ping -f (flood ping).
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.
qperf. On the first node, just run <tt>qperf</tt>. On the second, <tt>qperf -vvs SERVER_IP tcp_lat -m 4096</tt>.
== Why is it so slow ==
