Ok, average network latency from VM to OSD's ~0.4ms.
It's rather bad, you can improve the latency by 0.3ms just by upgrading the network.
Single threaded performance ~500-600 IOPS - or average latency of 1.6ms Is that comparable to what other are seeing?
Good "reference" numbers are 0.5ms for reads (~2000 iops) and 1ms for writes (~1000 iops).
I confirm that the most powerful thing to do is disabling CPU powersave (governor=performance + cpupower -D 0). You usually get 2x single thread iops at once.
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